Metallocene compound, catalyst for olefin polymer, method for producing olefin polymer, and olefin polymer

ABSTRACT

The invention provides a specific metallocene compound and an olefin polymerization catalyst for use for a catalyst for producing an olefin polymer having a sufficiently high molecular weight while maintaining excellent copolymerizability at a polymerization temperature and under polymerization conditions industrially advantageous in polymerization of an olefin such as ethylene or the like, and provides a method for producing an olefin polymer using the catalyst.

TECHNICAL FIELD

The present invention relates to a novel metallocene compound and amethod for producing an olefin polymer, and more precisely, to an olefinpolymerization catalyst excellent in copolymerizability in olefincopolymerization and capable of producing an olefin polymer having ahigh-molecular weight and to a method for producing an olefin polymerusing the catalyst.

BACKGROUND ART

As an olefin-based copolymer typically including an ethylene/α-olefincopolymer or a propylene/α-olefin copolymer, there have been produced abroad range of polymers having different physical properties that areexcellent in mechanical properties and cover from hard to soft ones; andregarding their use applications, the polymers are widely used coveringfrom industrial materials for films, sheets, fibers, nonwoven fabrics,various containers, molded articles, modifiers and others down to lifematerials.

In general, it is known that copolymers produced throughcopolymerization with a comonomer such as 1-butene, 1-hexene or the likeare excellent in the performance of flexibility, low-temperature impactresistance, environmental stress cracking resistance, transparency orthe like, as compared with an ethylene homopolymer and a propylenehomopolymer. For further improving these capabilities, it is necessaryto increase the comonomer content in the copolymer while thehigh-molecular weight of the copolymer is kept as such. In addition, itis known that, when a complex catalyst, as typified by a metallocenecatalyst, is used, then the comonomer introduced into the copolymer canbe uniformly distributed therein and the above-mentioned capabilities ofthe copolymer can be thereby further improved.

Consequently, in producing ethylene and propylene copolymers havingthese capabilities, it is desired to provide a complex catalystexcellent in copolymerizability and capable of producing ahigh-molecular-weight olefin copolymer in a temperature range of from 50to 300° C. that is efficient in an industrial process and capable ofproducing a copolymer having a high comonomer content even at a lowcomonomer concentration from the viewpoint of the process load. However,there is a report pointing out a problem that, in olefincopolymerization using a complex catalyst, as typified by a metallocenecatalyst, the molecular weight of the polymer to be obtained decreaseswith the elevation of the polymerization temperature or with theincrease in the comonomer content in the resultant copolymer (forexample, see NPL 1).

Accordingly, for producing the olefin polymers having thesecapabilities, there is desired a metallocene catalyst excellent incopolymerizability in a temperature range of from 50 to 300° C.efficient in an industrial process and capable of producing an olefincopolymer having a high molecular weight.

As a metallocene having excellent copolymerizability and capable ofproducing an olefin copolymer having a high molecular weight, there isknown a bridged bisindenyl complex having a phenyl group at the4-position of the indenyl ring. In particular, it is reported thatsubstituent introduction of a methyl group into the 2-position of theindenyl ring is effective for improving the molecular weight (see NPL 2,3), and therefore, searching for a 2-positioned substituent in a bridgedbisindenyl complex having a phenyl group at the 4-position thereof iskept continued for producing a polymer having a higher molecular weight.

NPL 4 reports that, in ethylene polymerization under a high-pressurecondition, a complex having an iPr group can produce a polyethylenehaving a higher molecular weight than a complex having an Me group asthe 2-position substituent thereof. PTL 1 and 2 report a complex havingan α-branched alkyl substituent at the 2-position, PTL 3 reports acomplex having a hetero-aromatic ring substituent at the 2-position, andPTL 4 to 7 report a complex in which the 2-positioned substituentdiffers between the two bisindenyl rings, all saying that the respectivecomplexes are effective for producing high-molecular-weight olefinpolymers and olefin copolymers. However, as a result of the presentinventors' investigations, it has become clarified that when thesecatalysts are used for polymerization at a high temperature preferredfrom the production efficiency, then the molecular weight of theresultant polymers is insufficient.

In addition, when the structure of the 2-positioned substituent becomesmore complicated, and in case where such complexes are produced on alarge scale that is industrially necessary in organic synthesis, thereoccurs a problem in that the production cost for the complexes increasesowing to the necessity of complicated synthesis routes and multi-stagesynthesis routes. Consequently, it is desired to develop a novel complexcapable of exhibiting more excellent performance than already-existingcatalysts, and at the same time, having a simple complex structure ascompared already-existing ones and capable of being synthesized easily.

Given the situation, there has been desired a metallocene compound whichis easy to synthesize and which can produce a high-molecular weightolefin copolymer at a polymerization temperature and underpolymerization conditions that are advantageous industrially whilemaintaining excellent copolymerizability, as well as a metallocenecatalyst and a production method for an olefin polymer using thecompound.

CITATION LIST Patent Literature

-   PTL 1: JP-T 2011-500800-   PTL 2: JP-T 2012-513463-   PTL 3: JP-A 2002-194016-   PTL 4: Japanese Patent 4901043-   PTL 5: Japanese Patent 4416507-   PTL 6: Japanese Patent 4288658-   PTL 7: JP-A 2004-352707

Non-Patent Literature

-   NPL 1: Macromol. Chem. Phys., 1996, Vol. 197, pp. 3091-3097-   PTL 2: Organometallics, 1994, Vol. 13, pp. 954-963-   PTL 3: Macromol. Chem. Phys., 2005, Vol. 206, pp. 1675-1683-   PTL 4: Macromol. Chem. Phys., 2005, Vol. 206, pp. 1043-1056

SUMMARY OF INVENTION Technical Problem

In consideration of the problems with the background art, the subjectmatter of the present invention is to provide a metallocene compound foruse as a catalyst for producing an olefin polymer, especially anethylenic copolymer having a sufficiently high molecular weight, at apolymerization temperature and under polymerization conditionsindustrially advantageous in polymerization of an olefin such asethylene or the like while maintaining excellent copolymerizability andthe olefin polymerization catalyst, as well as a production method foran olefin polymer using the catalyst.

Solution to Problem

For solving the above-mentioned problems, the present inventors havemade experimental investigations with many-sided observations forobtaining an olefin-based copolymer having a sufficiently high molecularweight under industrially advantageous conditions and maintainingexcellent copolymerizability according to an improved technical methodfor a metallocene catalyst as a polymerization catalyst for anolefin-based copolymer, and in the process thereof, the inventors havefound that, when an olefin polymerization catalyst that contains ametallocene compound having a specific structure is used, then an olefinpolymer having a sufficiently high molecular weight can be produced inpolymerization of an olefin such as ethylene or the like, at apolymerization temperature and under polymerization conditionsindustrially advantageous while exhibiting excellent copolymerizability,and have completed the present invention.

Specifically, the present inventors have found that, as a technicalmethod for solving the above-mentioned problems, a novel metallocenecompound having a specific substituent at a specific position, or thatis, a metallocene compound having a hydrogen atom as the substituent atthe 2-position of the indenyl ring thereof and having a bridgedbisindenyl skeleton with the two indenyl rings linked via one carbonatom having a substituent can solve the above-mentioned problems.

Accordingly, the olefin polymerization catalyst component containing themetallocene compound that constitutes the basic constitution of thepresent invention uses the novel, specific transition metal compound,and the catalyst is characterized by the chemical, stereospecific, andelectronic environmental structure of the ligand in the catalyststructure of the metallocene catalyst, and with that, the novel compoundis effective for producing an olefin-based copolymer having asufficiently high molecular weight under industrially advantageousconditions.

Specifically, the present invention includes the following constitutions(1) to (13).

(1) A metallocene compound represented by the following general formula[I]:

[In the formula [I], M represents Ti, Zr or Hf;

X¹ and X² are the same or different, each representing a hydrogen atom,an alkyl group having from 1 to 10 carbon atoms, an alkoxy group havingfrom 1 to 10 carbon atoms, an aryl group having from 6 to 20 carbonatoms, an aryloxy group having from 6 to 10 carbon atoms, an alkenylgroup having from 2 to 10 carbon atoms, an arylalkyl group having from 7to 40 carbon atoms, an alkylaryl group having from 7 to 40 carbon atoms,an arylalkenyl group having from 8 to 40 carbon atoms, an alkyl grouphaving from 1 to 20 carbon atoms and substituted with a silyl grouphaving a hydrocarbon group having from 1 to 6 carbon atoms, asubstituted amino group having from 1 to 10 carbon atoms, a group OH ora halogen atom;

R¹ to R⁹ and R¹¹ to R¹⁹ are the same or different, each representing ahydrogen atom, a halogen atom, an alkyl group having from 1 to 10 carbonatoms, a halogenoalkyl group having from 1 to 10 carbon atoms, an arylgroup having from 6 to 20 carbon atoms, an alkoxy group having from 1 to10 carbon atoms, a silyl group having a hydrocarbon group having from 1to 6 carbon atoms, an alkyl group having from 1 to 20 carbon atoms andsubstituted with a silyl group having a hydrocarbon group having from 1to 6 carbon atoms, a group —NR²¹ ₂, a group —SR²¹, a group —OSiR²¹ ₃ ora group —PR²¹ ₂ (where R²¹'s are the same or different, eachrepresenting a halogen atom, an alkyl group having from 1 to 10 carbonatom or an aryl group having from 6 to 20 carbon atoms), the neighboringgroups of R¹ to R⁹ and R¹¹ to R¹⁹ may form one or more aromatic rings oraliphatic rings along with the atom bonding them, or R⁴ and R⁵, or R⁴and R⁹, or R¹⁴ and R¹⁵, or R¹⁴ and R¹⁹ may form one aromatic ring oraliphatic ring along with the atom bonding them;

R¹⁰ and R²⁰ are the same or different, each representing a hydrogenatom, a halogen atom, an alkyl group having from 1 to 10 carbon atoms, afluoroalkyl group having from 1 to 10 carbon atoms, an alkoxy grouphaving from 1 to 10 carbon atoms, an aryl group having from 6 to 20carbon atoms, a fluoroaryl group having from 6 to 10 carbon atoms, anaryloxy group having from 6 to 10 carbon atoms, an alkenyl group havingfrom 2 to 10 carbon atoms, an arylalkyl group having from 7 to 40 carbonatoms, an alkylaryl group having from 7 to 40 carbon atoms, or anarylalkenyl group having from 8 to 40 carbon atoms, provided that R¹⁰and R²⁰ are not hydrogen atoms at the same time, and R¹⁰ and R²⁰ mayform one or more rings along with the atom bonding them.]

(2) The metallocene compound according to the (1) above, wherein R⁵ toR⁹ and R¹⁵ to R¹⁹ are the same or different, each representing ahydrogen atom, a halogen atom, an alkyl group having from 1 to 10 carbonatoms, a halogenoalkyl group having from 1 to 10 carbon atoms, an arylgroup having from 6 to 10 carbon atoms, a group —NR²¹ ₂, a group —SR²¹,a group —OSiR²¹ ₃ or a group —PR²¹ ₂ (where R²¹'s are the same ordifferent, each representing a halogen atom, an alkyl group having from1 to 10 carbon atom or an aryl group having from 6 to 10 carbon atoms),and all of R⁵ to R⁹ and R¹⁵ to R¹⁹ are not hydrogen atoms at the sametime.(3) The metallocene compound according to the (1) or (2) above, whereinR¹⁰ and R²⁰ are the same or different, each representing a halogen atom,an alkyl group having from 1 to 10 carbon atoms, a fluoroalkyl grouphaving from 1 to 10 carbon atoms, an aryl group having from 7 to 10carbon atoms, a fluoroaryl group having from 6 to 10 carbon atoms, analkenyl group having from 2 to 10 carbon atoms, an arylalkyl grouphaving from 7 to 40 carbon atoms, an alkylaryl group having from 7 to 40carbon atoms or an arylalkenyl group having from 8 to 40 carbon atoms,provided that the total of the carbon atoms that R¹⁰ and R²⁰ contain is2 or more, and R¹⁰ and R²⁰ may form one or more ring along with the atombonding them.(4) The metallocene compound according to any one of the (1) to (3)above, wherein R¹⁰ and R²⁰ may form one or more ring along with the atombonding them.(5) The metallocene compound according to the (4) above, wherein thering formed by R¹⁰ and R²⁰ is a 4-membered ring or a 5-membered ring.(6) The metallocene compound according to any one of the (1) to (5)above, wherein M is Hf.(7) An olefin polymerization catalyst comprising the followingcomponents (A) and (B), and optionally comprising the followingcomponent (C):Component (A): The metallocene compound according to any one of the (1)to (6) above.Component (B): A compound or an ion-exchanging layered silicate, whichreacts with the component (A) to form an ion pair.Component (C): An organoaluminium compound.(8) The olefin polymerization catalyst according to the (7) above,wherein the component (B) is a boron compound.(9) A method for producing an olefin polymer, which comprises carryingout an olefin polymerization or copolymerization using the olefinpolymerization catalyst according to the (7) or (8) above.(10) The method for producing an olefin polymer according to the (9)above, wherein the olefin to be used includes ethylene.(11) The method for producing an olefin polymer according to the (9) or(10) above, wherein the polymerization temperature is 120° C. or more.(12) An olefin polymer obtained according to the production methodaccording to any one of the (9) to (11) above.(13) The olefin polymer according to the (12) above, which is for useselected from a group consisting of films, sheets, fibers, nonwovenfabrics, containers, molded articles, modifiers, automobile parts, wiresand cables.

The subsidiary inventions (embodiment inventions) relative to the basicinvention (above-mentioned invention (1)) of the present invention, asmentioned above, are inventions where the substituent at each positionof the metallocene compound in the olefin polymerization catalystcomponent is specified (above-mentioned (2) to (5)), or where the centermetal is embodied (above-mentioned (6)), or where a polymerizationcatalyst is formed that comprises the metallocene compound as the maincatalyst component and is characterized by the cocatalyst component(above-mentioned (7) and (8)), or where a method for producing a(co)polymer of an olefin, especially ethylene using the polymerizationcatalyst is embodied (above-mentioned (9) to (11)), or where the olefinpolymer obtained by the method is embodied (above-mentioned (12) and(13)).

Using the metallocene compound of the present invention as an olefinpolymerization catalyst component makes it possible to produce anolefin-based copolymer having a sufficiently high molecular weight whileexhibiting excellent copolymerizability under industrially-advantageousconditions, as verified by the comparison between Examples andComparative Examples given hereinunder. The metallocene compoundrepresented by the general formula [I] of the present invention isbasically characterized by having a stereospecific andelectron-environmentally specific structure that has a hydrogen atom asthe substituent at the 2-position of the indenyl ring and has, at the4-position thereof, a phenyl group skeleton optionally having asubstituent, in which the two indenyl rings are linked via one carbonatom having a substituent. It is presumed that the characteristicfeatures of the compound would provide the specificity of the presentinvention.

The reason why the olefin polymerization catalyst of the presentinvention exhibits the above-mentioned functions and effects of thepresent invention will be discussed more concretely hereunder. It isconsidered that, in the compound, the bridging group that links theindenyl rings is a carbon atom having a small atomic radius andtherefore the space around the center metal has expanded and, as aresult, the compound could be readily reactive with a bulky comonomertherefore exhibiting excellent copolymerizability. In addition, it isconsidered that the structure where a hydrogen atom is arranged at the2-position of the indenyl ring can stereospecifically prevent polymerrelease reaction that is a reason of lowering the molecular weight of agrowing polymer chain including many bulky comonomers, and therefore thestructure of the type can increase the molecular weight of the polymerto be produced.

As verified by the comparison between Examples and Comparative Examplesto be given hereinunder, a structure having a methyl group at the2-position of the indenyl ring and having a silicon atom arranged in thebridging group could not provide a position environment capable ofsufficiently preventing polymer release reaction.

As opposed to the result, it is considered that the structure having ahydrogen atom at the 2-position of the indenyl ring and having a carbonatom as the bridging group, which has been found out in the presentinvention, can provide a suitable stereospecific environment capable ofsatisfying both the above-mentioned excellent copolymerizationperformance and the polymer release reaction retardation.

The present invention provides a significant difference from thealready-existing inventions described in the patent literature and thenon-patent literature shown in the citation list given hereinabove inpoint of the constituent features (specific matters of the invention)and the advantageous effects of the invention, and in particular,differing from already-existing knowledge in the art, the result of thepresent invention that the compound having a hydrogen atom at the2-position of the indenyl ring can give a high-molecular-weight olefinpolymer than any other compound having a substituent at the 2-positioncould not be anticipated at all from such already-existing literature.

In the above, the creation process of the present invention and thebasic constitutions and characteristics of the invention have beendescribed in the round, and the overall constitution of the presentinvention will be summarized in a panoramic view hereinunder. Thepresent invention includes the invention unit group of (1) to (13).

The metallocene compound represented by the general formula [I]constitutes the basic invention (1); and the inventions of (2) and theothers are those each comprising a subsidiary requirement added to thebasic invention, or embodiments of the basic invention. The invention ofthe polymerization catalyst of (7) and (8), the invention of theproduction method of (9) to (11) and the invention of the polymer of(12) and (13) each define the additional requirement for solution to thetechnical problems by the present invention. All the invention units arecollectively referred to as the invention group.

Advantageous Effects of Invention

Using the metallocene compound of the present invention as apolymerization catalyst makes it possible to provide an olefin polymerhaving a high molecular weight while exhibiting excellentcopolymerizability at a polymerization temperature and underpolymerization conditions that are industrially advantageous, ascompared with using already-existing metallocene compounds, andtherefore the metallocene compound, the olefin polymerization catalyst,and the olefin polymer production method using the olefin polymerizationcatalyst of the present invention are extremely useful from theindustrial viewpoint.

DESCRIPTION OF EMBODIMENTS

In the following, the metallocene compound, the olefin polymerizationcatalyst and the olefin polymer production method using the catalyst ofthe present invention are described concretely and in detail in eachitem.

1. Metallocene Compound

The metallocene compound of the present invention is a metallocenecompound having a specific substituent represented by the generalformula [I]. In view of the chemical structure thereof, the metallocenecompound includes structural isomers. For use for an olefinpolymerization catalyst, the racemic form of the compound is preferredto the meso form thereof.

[In the formula [I], M represents Ti, Zr or Hf;

X¹ and X² are the same or different, each representing a hydrogen atom,an alkyl group having from 1 to 10 carbon atoms, an alkoxy group havingfrom 1 to 10 carbon atoms, an aryl group having from 6 to 20 carbonatoms, an aryloxy group having from 6 to 10 carbon atoms, an alkenylgroup having from 2 to 10 carbon atoms, an arylalkyl group having from 7to 40 carbon atoms, an alkylaryl group having from 7 to 40 carbon atoms,an arylalkenyl group having from 8 to 40 carbon atoms, an alkyl grouphaving from 1 to 20 carbon atoms and substituted with a silyl grouphaving a hydrocarbon group having from 1 to 6 carbon atoms, asubstituted amino group having from 1 to 10 carbon atoms, a group OH ora halogen atom;

R¹ to R⁹ and R¹¹ to R¹⁹ are the same or different, each representing ahydrogen atom, a halogen atom, an alkyl group having from 1 to 10 carbonatoms, a halogenoalkyl group having from 1 to 10 carbon atoms, an arylgroup having from 6 to 20 carbon atoms, an alkoxy group having from 1 to10 carbon atoms, a silyl group having a hydrocarbon group having from 1to 6 carbon atoms, an alkyl group having from 1 to 20 carbon atoms andsubstituted with a silyl group having a hydrocarbon group having from 1to 6 carbon atoms, a group —NR²¹ ₂, a group —SR²¹, a group —OSiR²¹ ₃ ora group —PR²¹ ₂ (where R²¹'s are the same or different, eachrepresenting a halogen atom, an alkyl group having from 1 to 10 carbonatom or an aryl group having from 6 to 20 carbon atoms), the neighboringgroups of R¹ to R⁹ and R¹¹ to R¹⁹ may form one or more aromatic rings oraliphatic rings along with the atom bonding them, or R⁴ and R⁵, or R⁴and R⁹, or R¹⁴ and R¹⁵, or R¹⁴ and R¹⁹ may form one aromatic ring oraliphatic ring along with the atom bonding them;

R¹⁰ and R²⁰ are the same or different, each representing a hydrogenatom, a halogen atom, an alkyl group having from 1 to 10 carbon atoms, afluoroalkyl group having from 1 to 10 carbon atoms, an alkoxy grouphaving from 1 to 10 carbon atoms, an aryl group having from 6 to 20carbon atoms, a fluoroaryl group having from 6 to 10 carbon atoms, anaryloxy group having from 6 to 10 carbon atoms, an alkenyl group havingfrom 2 to 10 carbon atoms, an arylalkyl group having from 7 to 40 carbonatoms, an alkylaryl group having from 7 to 40 carbon atoms, or anarylalkenyl group having from 8 to 40 carbon atoms, provided that R¹⁰and R²⁰ are not hydrogen atoms at the same time, and R¹⁰ and R²⁰ mayform one or more rings along with the atom bonding them.]

In the general formula [I], M is a titanium atom, a zirconium atom or ahafnium atom, and is preferably zirconium or hafnium, more preferablyhafnium.

X¹ and X² each represent a hydrogen atom, an alkyl group having from 1to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, anaryl group having from 6 to 20 carbon atoms, an aryloxy group havingfrom 6 to 10 carbon atoms, an alkenyl group having from 2 to 10 carbonatoms, an arylalkyl group having from 7 to 40 carbon atoms, an alkylarylgroup having from 7 to 40 carbon atoms, an arylalkenyl group having from8 to 40 carbon atoms, an alkyl group having from 1 to 20 carbon atomsand substituted with a silyl group having a hydrocarbon group havingfrom 1 to 6 carbon atoms, a substituted amino group having from 1 to 10carbon atoms, a group OH or a halogen atom. Concretely, there arementioned a chlorine atom, a bromine atom, an iodine atom, a fluorineatom, a methyl group, an ethyl group, a propyl group, an n-butyl group,an i-butyl group, a phenyl group, a benzyl group, a dimethylamino group,a diethylamino group, a trimethylsilylmethyl group, etc.

Concretely, especially preferred are a chlorine atom, a methyl group, ani-butyl group, a phenyl group, a benzyl group and a trimethylsilylmethylgroup. Most preferred are a chlorine atom, a methyl group, an i-butylgroup, a benzyl group and a trimethylsilylmethyl group.

Specific examples of the alkyl group having from 1 to 10 carbon atoms inthe general formula [I] include methyl, ethyl, n-propyl, i-propyl,n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, n-hexyl, cyclopropyl,cyclopentyl, cyclohexyl, n-heptyl, n-octyl, n-decyl, etc.

The halogen atom of the halogenoalkyl group having from 1 to 10 carbonatoms includes a fluorine atom, a chlorine atom, a bromine atom, aniodine atom, etc., and the halogenoalkyl group having from 1 to 10carbon atom is an alkyl group having from 1 to 10 carbon atom in whichthe hydrogen atom on the skeleton is substituted with a halogen.

Specific examples of the group include fluoromethyl, difluoromethyl,trifluoromethyl, chloromethyl, dichloromethyl, trichloromethyl,bromomethyl, dibromomethyl, tribromomethyl, iodomethyl,2,2,2-trifluoroethyl, 2,2,1,1-tetrafluoroethyl, pentafluoroethyl,pentachloroethyl, pentafluoropropyl, nonafluorobutyl, 5-chloropentyl,5,5,5-trichloropentyl, 5-fluoropentyl, 5,5,5-trifluoropentyl,6-chlorohexyl, 6,6,6-trichlorohexyl, 6-fluorohexyl,6,6,6-trifluorohexyl, etc.

The aryl group having from 6 to 20 carbon atoms concretely includesphenyl, 1-naphthyl, 2-naphthyl, acenaphthyl, phenanthryl, anthryl, etc.

The fluoroalkyl group having from 1 to 10 carbon atoms is an alkyl grouphaving from 1 to 10 carbon atoms in which the hydrogen atom on theskeleton is substituted with a fluorine atom.

Specific examples of the group include fluoromethyl, difluoromethyl,trifluoromethyl, 2,2,2-trifluoroethyl, 2,2,1,1-tetrafluoroethyl,pentafluoroethyl, pentafluoropropyl, 5-fluoropentyl,5,5,5-trifluoropentyl, 6-fluorohexyl, 6,6,6-trifluorohexyl, etc.

Specific examples of the alkoxy group having from 1 to 10 carbon atomsinclude methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy,s-butoxy, t-butoxy, n-pentoxy, n-hexoxy, cyclopropoxy, cyclopentoxy,cyclohexoxy, n-octoxy, n-decoxy, etc.

The fluoroaryl group having from 6 to 10 carbon atoms is an aryl grouphaving from 6 to 10 carbon atoms in which the hydrogen atom on theskeleton is substituted with a fluorine atom. Specific examples of thegroup include pentafluorophenyl, 2-fluorophenyl, 3-fluorophenyl,4-fluorophenyl, di(trifluoromethyl)phenyl, pentafluoroethylphenyl,nonafluoro-t-butylphenyl, 1-perfluoronaphthyl, 2-perfluoronaphthyl, etc.

The aryloxy group having from 6 to 10 carbon atoms may be substitutedwith a hydrocarbon group having from 1 to 4 carbon atoms, and specificexamples of the group include phenoxy, trimethylphenoxy,dimethylphenoxy, ethylphenoxy, t-butylphenoxy, 1-naphthoxy, 2-naphthoxy,etc.

The alkenyl group having from 2 to 10 carbon atoms concretely includesvinyl, 1-propenyl, 2-propenyl, 3-butenyl, 5-hexenyl, 7-octenyl, etc.

The arylalkyl group having from 7 to 40 carbon atoms concretely includesbenzyl, phenylethyl, (methylphenyl)methyl, (tert-butylphenyl)methyl,etc.

The alkylaryl group having from 7 to 40 carbon atoms concretely includestolyl, dimethylphenyl, ethylphenyl, trimethylphenyl, t-butylphenyl, etc.

The arylalkenyl group having from 8 to 40 carbon atoms concretelyincludes vinylphenyl, (2-propenyl)phenyl, etc.

The alkyl group having from 1 to 20 carbon atoms and substituted with asilyl group having a hydrocarbon group having from 1 to 6 carbon atomsconcretely includes a trimethylsilylmethyl group, a triethylsilylmethylgroup, a triphenylsilylmethyl group, etc.

The substituted amino group having from 1 to 10 carbon atoms concretelyincludes a dimethylamino group, a diethylamino group, a diisopropylaminogroup, etc.

The silyl group having a hydrocarbon group having from 1 to 6 carbonatoms concretely includes a trimethylsilyl group, a triethylsilyl group,a tert-butyl(dimethyl)silyl group, a triphenylsilyl group, etc.

A preferred group R²¹ is an alkyl group having from 1 to 10 carbon atomsor an aryl group having from 6 to 10 carbon atoms; and a preferred group—NR²¹ ₂ concretely includes a dimethyl amino group, a diethylaminogroup, a diisopropylamino group, etc.

The group —SR²¹ concretely includes a methylsulfanyl group, anethylsulfanyl group, an isopropylsulfanyl group, a phenylsulfanyl group,etc.

The group —OSiR²¹ ₃ concretely includes a trimethylsiloxy group, atriethylsiloxy group, a triisopropylsiloxy group, a triphenylsiloxygroup, a tert-butyl(dimethyl)siloxy group, etc.

The group —PR²¹ ₂ concretely includes a dimethylphosphino group, adiethylphosphino group, a diisopropylphosphino group, a dibutylphosphinogroup, a diphenylphosphino group, etc.

Preferably, R¹, R², R³, R⁴, R¹¹, R¹², R¹³ and R¹⁴ are hydrogen atoms.

Preferably, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁵, R¹⁶, R¹⁷, R¹⁸ and R¹⁹ are eachindependently a hydrogen atom, an alkyl group having from 1 to 10 carbonatoms, a halogenoalkyl group having from 1 to 10 carbon atoms, an arylgroup having from 6 to 10 carbon atoms, a silyl group having ahydrocarbon group having from 1 to 6 carbon atoms, or an alkyl grouphaving from 1 to 20 carbon atoms and substituted with a silyl grouphaving a hydrocarbon group having from 1 to 6 carbon atoms, morepreferably a hydrogen atom, an alkyl group having from 1 to 10 carbonatoms, a halogenoalkyl group having from 1 to 10 carbon atoms, or anaryl group having from 6 to 10 carbon atoms. Preferably, R⁵ to R⁹ andR¹⁵ to R¹⁹ are not hydrogen atoms at the same time.

Preferably, R¹⁰ and R²⁰ each are a halogen atom, an alkyl group havingfrom 1 to 10 carbon atoms, a fluoroalkyl group having from 1 to 10carbon atoms, an aryl group having from 7 to 10 carbon atoms, afluoroaryl group having from 6 to 10 carbon atoms, an alkenyl grouphaving from 2 to 10 carbon atoms, an arylalkyl group having from 7 to 40carbon atoms, an alkylaryl group having from 7 to 40 carbon atoms, or anarylalkenyl group having from 8 to 40 carbon atoms, more preferably analkyl group having from 1 to 10 carbon atoms, an aryl group having from7 to 10 carbon atoms or an alkenyl group having from 2 to 10 carbonatoms, and in addition, the total of the carbon atoms that R¹⁰ and R²⁰have is 2 or more. Also preferably, R¹⁰ and R²⁰ form one or more ringsalong with the atom bonding them, more preferably form a 4- to5-membered ring.

Specific Examples of Metallocene Compound:

Specific examples of the metallocene compound of the present inventionare shown below. These are typical exemplifications.

-   Isopropylidene-bridged metallocene compounds-   Isopropylidenebis(4-phenyl-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-trifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-methoxyphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-isopropoxyphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-fluorophenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-chlorophenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-bromophenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-diisopropylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-dimethoxyphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(3,5-ditrifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,3,5,6-tetramethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,3,4,5,6-pentamethylphenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(4-tert-butyl-2-methyl-phenyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-biphenyl-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2,6-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2′,6′-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(1-naphthyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-(2-naphthyl)-1-indenyl)dimethylhafnium-   Isopropylidenebis(4-phenanthryl-1-indenyl)dimethylhafnium-   Cyclobutylidene-bridged metallocene compounds-   Cyclobutylidenebis(4-phenyl-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-trifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-methoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-isopropoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-fluorophenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-chlorophenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-bromophenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-diisopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-dimethoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(3,5-ditrifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,3,5,6-tetramethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,3,4,5,6-pentamethylphenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(4-tert-butyl-2-methyl-phenyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-biphenyl-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2,6-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2′,6′-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(1-naphthyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-(2-naphthyl)-1-indenyl)dimethylhafnium-   Cyclobutylidenebis(4-phenanthryl-1-indenyl)dimethylhafnium-   Cyclopentylidene-bridged metallocene compounds-   Cyclopentylidenebis(4-phenyl-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-trifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-methoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-isopropoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-fluorophenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-chlorophenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-bromophenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-diisopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-dimethoxyphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-ditrimethoxysilylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(3,5-ditrifluoromethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,3,5,6-tetramethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,3,4,5,6-pentamethylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2,6-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2′,6′-dimethylbiphenylyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(1-naphthyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-(2-naphthyl)-1-indenyl)dimethylhafnium-   Cyclopentylidenebis(4-phenanthryl-1-indenyl)dimethylhafnium-   Cyclohexylidene-bridged metallocene compounds-   Cyclohexylidenebis(4-phenyl-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(4-trimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(3,5-di-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-(4-terg-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Cyclohexylidenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Diethylmethylene-bridged metallocene compounds-   Diethylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Diethylmethylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Di-n-propylmethylene-bridged metallocene compounds-   Di-n-propylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(4-isopropylphenyl-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Di-n-propylmethylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Di-iso-butylmethylene-bridged metallocene compounds-   Di-iso-butylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Di-iso-butylmethylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Dibenzylmethylene-bridged metallocene compounds-   Dibenzylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Dibenzylmethylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylene-bridged metallocene compounds-   Methyl(ethyl)methylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(ethyl)methylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylene-bridged metallocene compounds-   Methyl(n-propyl)methylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(4-terg-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(n-propyl)methylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylene-bridged metallocene compound-   Methyl(iso-butyl)methylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3-terg-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(iso-butyl)methylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylene-bridged metallocene compounds-   Methyl(benzyl)methylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3-isopropylphpenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Methyl(benzyl)methylenebis(4-biphenylyl-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylene-bridged metallocene compounds-   Di(4-methylphenyl)methylenebis(4-phenyl-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3-methylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3-isopropylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(4-methylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(4-isopropylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(4-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(4-trimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(2-methylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(2-ethylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3,5-di-tert-butylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(3,5-ditrimethylsilylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(2,6-dimethylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-(4-tert-butyl-2-methylphenyl)-1-indenyl)dimethylhafnium-   Di(4-methylphenyl)methylenebis(4-biphenylyl-1-indenyl)dimethylhafnium

In addition to the above, there are further exemplified compoundsderived from the above-exemplified compounds, in which M is titanium orzirconium in place of hafnium; and compounds in which either one or bothof X¹ and X² is/are a chlorine atom, a bromine atom, an iodine atom, aphenyl group, a benzyl group, a dimethylamino group, a diethylaminogroup, a trimethylsilyl group or the like in place of the methyl groupin the above-exemplified compounds.

Synthesis Method for Metallocene Compounds:

The metallocene compound of the present may be synthesized in any methoddepending on the substituents and the bonding modes therein. One typicalexample of a synthesis route is shown below.

In the above-mentioned synthesis route, the compound 1 is coupled withphenylboronic acid in the presence of a palladium catalyst to give thecompound 2. The compound 2 may be bridged to give the compound 3according to a method described in a publication (Japanese Patent3835846) or the like. The compound 2 may be anionized with potassiumhydroxide and then reacted with acetone to give the compound 3. Thecompound 3 may be dianionized with 2 equivalents of n-butyllithium orthe like, and then reacted with hafnium tetrachloride to give themetallocene compound 4. In general, the metallocene compound 4 isobtained as a mixture of a racemic form and a meso form thereof, and theracemic form excellent in catalytic potency is concentration throughpurification. In addition, according to a method described in apublication (WO2000/017213), the meso form may be isomerized into theracemic form to increase the yield of the racemic form. The dimethylform 5 may be obtained by processing the metallocene compound 4 with 2equivalents or more of MeMgBr or the like.

A substituted metallocene compound may be synthesized, using acorrespondingly-substituted material. Using acorrespondingly-substituted boronic acid, for example,4-isopropylphenylboronic acid, 3,5-dimethylphenylboronic acid or thelike in place of phenylboronic acid introduces the substituent (R⁵ toR⁹, R¹⁵ to R¹⁹) into the 4-positioned phenyl group of the indenyl ring.

A metallocene compound having a different substituent on the bridginggroup may be synthesized, using a correspondingly-substituted material.Using a corresponding ketone compound, for example, cyclobutanone,4-heptenone or the like in place of acetone introduces the substituent(R¹⁰, R²⁰) into the bridging group.

2. Olefin Polymerization Catalyst

(1) Components of Olefin Polymerization Catalyst

The metallocene compound of the present invention forms an olefinpolymerization catalyst component, and the catalyst component may beused in an olefin polymerization catalyst. For example, preferably usedhere is an olefin polymerization catalyst to be mentioned hereinunder,which contains the metallocene compound as a component (A) therein.

The olefin polymerization catalyst of the present invention contains thefollowing (A) and (B) and optionally contains the following component(C).

Component (A): Metallocene compound represented by the general formula[I].

Component (B): Compound or ion-exchanging layered silicate reacting withthe component (A) to form an ion pair.

Component (C): Organoaluminium compound.

(2) Description of Components

(2-1) Component (A)

Regarding the metallocene compound represented by the general formula[I] for the component (A), two or more same or different types of thecompounds represented by the general formula [I] may be used here.

(2-2) Component (B)

The component (B) is a compound or an ion-exchanging layered silicatethat reacts with the component (A) to form an ion pair. The compoundthat reacts with the component (A) to form an ion pair includes anorganoaluminiumoxy compound, a boron compound, a zinc compound, etc.Preferred is an organoaluminiumoxy compound or a boron compound, andmore preferred is a boron compound. One or more of these components (B)may be used here either singly or as combined.

(2-2-1) Organoaluminiumoxy Compound

The organoaluminiumoxy compound, one type of the component (B) has anAl—O—Al bond in the molecule, in which the number of the bonds isgenerally from 1 to 100, preferably from 1 to 50. The organoaluminiumoxycompound of the type is obtained generally by reacting anorganoaluminium compound with water or an aromatic carboxylic acid.

The reaction of an organoaluminium with water is carried out generallyin an inert hydrocarbon (solvent). The inert hydrocarbon includes analiphatic hydrocarbon, an alicyclic hydrocarbon and an aromatichydrocarbon, such as pentane, hexane, heptane, cyclohexane,methylcyclohexane, benzene, toluene, xylene, etc. Preferred is use of analiphatic hydrocarbon or an aromatic hydrocarbon.

As the organoaluminium compound for use for preparing theorganoaluminiumoxy compound, usable is any compound represented by thefollowing general formula [II]. Preferred is use of a trialkylaluminium.R^(a) _(t)AlX^(a) _(3-t)  [II](In the formula [II], R^(a) represents a hydrocarbon group such as analkyl group, an alkenyl group, an aryl group, an aralkyl group or thelike having from 1 to 18 carbon atoms, preferably from 1 to 12 carbonatoms; X^(a) represents a hydrogen atom or a halogen atom; t indicatesan integer of 1≦t≦3.)

The alkyl group in the trialkylaluminium may be any of a methyl group,an ethyl group, a propyl group, an isopropyl group, a butyl group, anisobutyl group, a pentyl group, a hexyl group, an octyl group, a decylgroup, a dodecyl group or the like, but is preferably a methyl group oran isobutyl group, more preferably a methyl group.

Two or more of the above-mentioned organoaluminium compounds may be usedhere as combined.

The reaction ratio of water to the organoaluminium compound (molar ratioof water/Al) is preferably from 0.25/1 to 1.2/1, more preferably from0.5/1 to 1/1, and the reaction temperature generally falls within arange of from −70 to 100° C., preferably from −20 to 20° C. The reactiontime is selected generally from a range of from 5 minutes to 24 hours,preferably from 10 minutes to 5 hours. As water for the reaction, notonly simple water but also crystal water contained in copper sulfatehydrate, aluminium sulfate hydrate or the like as well as a componentcapable of forming water in a reaction system can also be used.

Of the above-mentioned organoaluminiumoxy compounds, those obtained byreacting an alkylaluminium and water are generally referred toaluminoxanes, and in particular, methylaluminoxane (including thosesubstantially comprising methylaluminoxane (MAO)) is preferred as theorganoaluminiumoxy compound here.

Needless to say, two or more of the above-mentioned organoaluminiumoxycompounds may be used here as combined, and a solution or dispersionprepared by dissolving or dispersing the organoaluminiumoxy compound inthe above-mentioned inert hydrocarbon solvent may also be used here.

As the organoaluminiumoxy compound, exemplified here are thoserepresented by the following general formula [III].

(In the formula [III], R^(b) represents a hydrocarbon group such as analkyl group, an alkenyl group, an aryl group, an aralkyl group or thelike having from 1 to 18 carbon atoms, preferably from 1 to 12 carbonatoms; R^(c) represents a hydrocarbon group having from 1 to 10 carbonatoms. Plural R^(b)'s in the formula [III] may be the same as ordifferent from each other.)

The compound represented by the general formula [III] may be obtained byreacting one type of a trialkylaluminium or two or more types oftrialkylaluminiums and an alkylboronic acid represented by a generalformula, R^(c)B(OH)₂ in a ratio (by mol) of from 10/1 to 1/1. In thegeneral formula, R^(c) represents a hydrocarbon group having from 1 to10 carbon atoms, preferably from 1 to 6 carbon atoms.

(2-2-2) Boron Compound

The boron compound, one type of the component (B) includes a boranecompound, borate compound, etc.

Concrete examples of the borane compound include triphenylborane,tri(o-tolyl)borane, tri(p-tolyl)borane, tri(m-tolyl)borane,tri(o-fluorophenyl)borane, tris(p-fluorophenyl)borane,tris(m-fluorophenyl)borane, tris(2,5-difluorophenyl)borane,tris(3,5-difluorophenyl)borane, tris(4-trifluoromethylphenyl)borane,tris(3,5-ditrifluoromethylphenyl)borane,tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane,tris(perfluoronaphthyl)borane, tris(perfluorobiphenylyl)borane,tris(perfluoroanthryl)borane, tris(perfluorobinaphthyl)borane, etc.

Of those, preferred are tris(3,5-ditrifluoromethylphenyl)borane,tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane,tris(perfluoronaphthyl)borane, tris(perfluorobiphenylyl)borane,tris(perfluoroanthryl)borane and tris(perfluorobinaphthyl)borane; andmore preferred are tris(2,6-ditrifluoromethylphenyl)borane,tris(pentafluorophenyl)borane, tris(perfluoronaphthyl)borane andtris(perfluorobiphenylyl)borane.

The borate compound is described concretely. The first example of thecompound is a compound represented by the following general formula[IV].[L¹-H]⁺[BR^(d)R^(e)X^(b)X^(c)]⁻  [IV]

In the formula [IV], L¹ represents a neutral Lewis base; H represents ahydrogen atom; [L¹-H]represents a Broensted acid such as ammonium,anilinium, phosphonium, etc. Examples of include trialkyl-substitutedammoniums such as trimethylammonium, triethylammonium,tripropylammonium, tributylammonium, tri(n-butyl)ammonium, etc.; anddialkylammoniums such as di(n-propyl)ammonium, dicyclohexylammonium,etc.

Examples of anilinium include N,N-dialkylaniliniums such asN,N-dimethylanilinium, N,N-diethylanilinium,N,N-2,4,6-pentamethylanilinium, etc.

Examples of phosphonium include triarylphosphoniums andtrialkylphosphoniums such as triphenylphosphonium, tributylphosphonium,tri(methylphenyl)phosphonium, tri(dimethylphenyl)phosphonium, etc.

In the formula [IV], R^(d) and R^(e) represent same or differentaromatic or substituted aromatic hydrocarbon groups each having from 6to 20 carbon atoms, preferably from 6 to 16 carbon atoms, and these maybe bridged via a bridging group. The substituent in the substitutedaromatic hydrocarbon group is preferably an alkyl group typed by amethyl group, an ethyl group, a propyl group, an isopropyl group or thelike, or a halogen such as fluorine, chlorine, bromine, iodine, etc.

X^(b) and X^(c) each independently represent a hydride group, a halogenatom, a hydrocarbon group having from 1 to 20 carbon atoms, or asubstituted hydrocarbon group having from 1 to 20 carbon atoms in whichat least one hydrogen atom is substituted with a halogen atom.

Specific examples of the compound represented by the general formula[IV] include tributylammonium tetra(pentafluorophenyl)borate,tributylammonium tetra(2,6-ditrifluoromethylphenyl)borate,tributylammonium tetra(3,5-ditrifluoromethylphenyl)borate,tributylammonium tetra(2,6-difluorophenyl)borate, tributylammoniumtetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluorophenyl)borate, dimethylaniliniumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(2,6-difluorophenyl)borate, dimethylaniliniumtetra(perfluoronaphthyl)borate, triphenylphosphoniumtetra(pentafluorophenyl)borate, triphenylphosphoniumtetra(2,6-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(3,5-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(2,6-difluorophenyl)borate, triphenylphosphoniumtetra(perfluoronaphthyl)borate, trimethylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(pentafluorophenyl)borate, triethylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(perfluoronaphthyl)borate, tripropylammoniumtetra(pentafluorophenyl)borate, tripropylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tripropylammoniumtetra(perfluoronaphthyl)borate, di(1-propyl)ammoniumtetra(pentafluorophenyl)borate, dicyclohexylammonium tetraphenylborate,etc.

Of those, preferred are tributylammonium tetra(pentafluorophenyl)borate,tributylammonium tetra(2,6-ditrifluoromethylphenyl)borate,tributylammonium tetra(3,5-ditrifluoromethylphenyl)borate,tributylammonium tetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluorophenyl)borate, dimethylaniliniumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate, and dimethylaniliniumtetra(perfluoronaphthyl)borate.

Of those, most preferred are tributylammoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tributylammoniumtetra(3,5-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(pentafluorophenyl)borate, dimethylaniliniumtetra(2,6-ditrifluoromethylphenyl)borate, and dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate.

The second example of the borate compound is represented by thefollowing general formula [V].[L²]⁺[BR^(d)R^(e)X^(b)X^(c)]  [V]

In the formula [V], L² includes a carbocation, a methyl cation, an ethylcation, a propyl cation, an isopropyl cation, a butyl cation, anisobutyl cation, a tert-butyl cation, a pentyl cation, a tropiniumcation, a benzyl cation, a trityl cation, a sodium cation, a proton,etc. R^(d), R^(e), X^(b) and X^(c) have the same definitions as in theabove-mentioned general formula [IV].

Specific examples of the compound represented by the general formula [V]include trityl tetraphenylborate, trityl tetra(o-tolyl)borate, trityltetra(p-tolyl)borate, trityl tetra(m-tolyl)borate, trityltetra(o-fluorophenyl)borate, trityl tetra(p-fluorophenyl)borate, trityltetra(m-fluorophenyl)borate, trityl tetra(3,5-difluorophenyl)borate,trityl tetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylphenyl)borate, trityltetra(perfluoronaphthyl)borate, tropinium tetraphenylborate, tropiniumtetra(o-tolyl)borate, tropinium tetra(p-tolyl)borate, tropiniumtetra(m-tolyl)borate, tropinium tetra(o-fluorophenyl)borate, tropiniumtetra(p-fluorophenyl)borate, tropinium tetra(m-fluorophenyl)borate,tropinium tetra(3,5-difluorophenyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(3,5-ditrifluoromethylphenyl)borate, tropiniumtetra(perfluoronaphthyl)borate, sodium tetraphenylborate, sodiumtetra(o-tolyl)borate, sodium tetra(p-tolyl)borate, sodiumtetra(m-tolyl)borate, sodium tetra(o-fluorophenyl)borate, sodiumtetra(p-fluorophenyl)borate, sodium tetra(m-fluorophenyl)borate, sodiumtetra(3,5-difluorophenyl)borate, sodium tetra(pentafluorophenyl)borate,sodium tetra(2,6-ditrifluoromethylphenyl)borate, sodiumtetra(3,5-ditrifluoromethylphenyl)borate, sodiumtetra(perfluoronaphthyl)borate, hydrogen tetraphenylborate 2 diethylether, hydrogen tetra(3,5-difluoromethylphenyl)borate 2 diethyl ether,hydrogen tetra(pentafluorophenyl)borate 2 diethyl ether, hydrogentetra(2,6-ditrifluoromethylphenyl)borate 2 diethyl ether, hydrogentetra(3,5-ditrifluoromethylphenyl)borate 2 diethyl ether, hydrogentetra(perfluoronaphthyl)borate 2 diethyl ether, etc.

Of those, preferred are trityl tetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylphenyl)borate, trityltetra(perfluoronaphthyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(3,5-ditrifluoromethylphenyl)borate, tropiniumtetra(perfluoronaphthyl)borate, sodium tetra(pentafluorophenyl)borate,sodium tetra(2,6-ditrifluoromethylphenyl)borate, sodiumtetra(3,5-ditrifluoromethylphenyl)borate, sodiumtetra(perfluoronaphthyl)borate, hydrogen tetra(pentafluorophenyl)borate2 diethyl ether, hydrogen tetra(2,6-ditrifluoromethylphenyl)borate 2diethyl ether, hydrogen tetra(3,5-ditrifluoromethylphenyl)borate 2diethyl ether, and hydrogen tetra(perfluoronaphthyl)borate 2 diethylether.

Of those, more preferred are trityl tetra(pentafluorophenyl)borate,trityl tetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, sodiumtetra(pentafluorophenyl)borate, sodiumtetra(2,6-ditrifluoromethylphenyl)borate, hydrogentetra(pentafluorophenyl)borate 2 diethyl ether, hydrogentetra(2,6-ditrifluoromethylphenyl)borate 2 diethyl ether, and hydrogentetra(3,5-ditrifluoromethylphenyl)borate 2 diethyl ether.

As the component (B) in the olefin polymerization catalyst, also usableis a mixture of the above-mentioned organoaluminiumoxy compound and theabove-mentioned borane compound or borate compound. Two or moredifferent types of the borane compounds or the borate compounds may beused as combined.

(2-2-3) Ion-Exchanging Layered Silicate

The ion-exchanging layered silicate (hereinafter this may be simplyabbreviated as “silicate”) is a silicate compound having a crystalstructure in which the constituent planes are layered in parallel toeach other by the bonding force of an ionic bond or the like and inwhich the contained ion is exchangeable. Various types of such silicatesare known and are concretely described in “Clay Mineralogy” by HaruoShirozu, Asakura Publishing (1995).

In the present invention, those belonging to the smectite family arepreferably used as the component (B), and concretely mentioned aremontmorillonite, sauuconite, beidellite, nontronite, saponite,hectorite, stevensite, etc.

Most silicates are, as natural products, mostly produced as the maincomponent of clay minerals, and therefore often contain any otherimpurities (quartz, cristobalite, etc.) than ion-exchanging layeredsilicates, and the smectite family silicates for use in the presentinvention may contain such impurities.

Granulation of Ion-Exchanging Layered Silicate:

For use herein, the silicate may be either in a dry state or in the formof a liquid slurry. The shape of the ion-exchanging layered silicate isnot specifically defined. The silicate may be in the form thereof justproduced in nature or in the form thereof just artificially synthesized.If desired, the form of the ion-exchanging layered silicate for useherein may be modified through operation of grinding, granulation,classification or the like. Of those, especially preferred aregranulated silicates as capable of providing good polymer particulateperformance.

The form modification of the ion-exchanging layered silicate throughgranulation, grinding, classification or the like may be carried outbefore acid treatment, or the form of the silicate may be modified afteracid treatment.

Not specifically defined, the granulation method employable hereincludes, for example, a stirring granulation method, a sprayinggranulation method, a rolling granulation method, a briquettinggranulation method, a compacting granulation method, an extrusiongranulation method, a fluidized-bed granulation method, an emulsiongranulation method, a submerged granulation method, a compressionmolding granulation method, etc. Preferred are a stirring granulationmethod, a spraying granulation method, a rolling granulation method, anda fluidized-bed granulation method; and more preferred are a stirringgranulation method, and a spraying granulation method.

In spraying granulation, water or an organic solvent such as methanol,ethanol, chloroform, methylene chloride, pentane, hexane, heptane,toluene, xylene or the like may be used as the dispersion medium for thestarting slurry. Preferably, water is used as the dispersion medium. Theconcentration of the component (B) in the starting slurry liquid inspraying granulation that gives spherical particles is from 0.1 to 30%by weight, preferably from 0.5 to 20% by weight, more preferably from 1to 10% by weight. The temperature of the inlet port for the hot air inspraying granulation that gives spherical particles may vary dependingon the dispersion medium used. In a case where water is used, thetemperature may be from 80 to 260° C., preferably from 100 to 220° C.

In granulation, for obtaining a carrier having a high particle strengthand for improving the olefin polymerization activity, the silicate isoptionally fine-grained. The silicate may be fine-grained in any method.Regarding the fine-graining method, the silicate may be fine-grainedeither in dry or in wet condition. Preferred is a wet-grinding methodusing water as the dispersion medium and utilizing the swellability ofthe silicate. For example, there are mentioned a forcedly stirringmethod using Polytron or the like, and a method using a Dyno mill, apearl mill or the like. The mean particle size before granulation may befrom 0.01 to 3 μm, preferably from 0.05 to 1 μm.

If desired, an organic substance, an inorganic solvent, an inorganicsalt or various types of binders may be used in granulation. The usablebinder includes, for example, magnesium chloride, aluminium sulfate,aluminium chloride, magnesium sulfate, alcohols, glycol, etc.

The spherical particles obtained as above preferably have a compressivefragmentation strength of 0.2 MPa or more for preventing fragmentationor powdering in the polymerization step. The particle size of thegranulated ion-exchanging layered silicate may be from 0.1 to 1000 μm,preferably from 1 to 500 μm. The grinding method is not alsospecifically defined, for which employable is any of dry grinding or wetgrinding.

Acid Treatment:

The silicate for use in the present invention is subjected to acidtreatment before use, and may be subjected to any combined treatmentwith any other chemical treatment. The other chemical treatment includesalkali treatment, salt treatment, organic treatment, etc.

The acid treatment of the silicate may change the acid strength of thesolid. The acid treatment is effective for ion exchange and for removalof surface impurities, and is additionally effective for eluting a partof cations such as Al, Fe, Mg, Li and the like in the crystal structure.

The acid for use for the acid treatment includes hydrochloric acid,nitric acid, sulfuric acid, phosphoric acid, acetic acid, oxalic acid,benzoic acid, stearic acid, propionic acid, acrylic acid, maleic acid,fumaric acid, phthalic acid, etc. Two or more of these may be used at atime. Above all, preferred are inorganic acids. Preferred are sulfuricacid, hydrochloric acid and nitric acid; and more preferred is sulfuricacid.

A method of combined treatment of acid treatment and salt treatment ispreferred, including a method of salt treatment followed by acidtreatment, a method of acid treatment followed by salt treatment, amethod of simultaneous salt treatment and acid treatment, a method ofsalt treatment followed by simultaneous salt treatment and acidtreatment.

Regarding the acid treatment condition, in general, the acidconcentration may be from 0.1 to 30% by weight, the treatmenttemperature may fall a temperature range of from room temperature to theboiling point of the solvent used, and the treatment time may be from 5minutes to 24 hours. Preferably, the treatment is carried out under thecondition under which at least a part of the compound to be treatedcould be eluted. In general, the acid is used in the form of an aqueoussolution thereof. For example, in a case of using sulfuric acid, thetreatment temperature is preferably from 80° C. to 100° C., and thetreatment time is preferably from 0.5 hours to less than 5 hours.

The treatment simultaneously combined with salt treatment to form anionic complex, a molecular complex, an organic derivative or the likemay change the surface area and the interlayer distance. For example, byutilizing the ion exchangeability, the interlayer exchanging ion may besubstituted with any other bulky ion to give a layered substance wherethe interlayer distance is enlarged.

Before, during or after the acid treatment, the silicate may be groundor particulated for shape control. In addition, the treatment may becombined with any other chemical treatment such as alkali treatment,organic compound treatment, organic metal treatment, etc.

The salt for use for ion exchange is a compound that contains a cationcontaining at least one atom selected from a group consisting of Group 1to Group 14 atoms of the Long Periodic Table (hereinafter simplyreferred to as “Periodic Table”), and is preferably a compound thatcomprises a cation containing at least one atom selected from a groupconsisting of Group 1 to Group 14 atoms of the Periodic Table and ananion derived from at least one atom or atomic group selected from agroup consisting of a halogen atom, an inorganic acid and an organicacid, more preferably a compound that comprises a cation containing atleast one atom selected from a group consisting of Group 2 to Group 14atoms of the Periodic Table, and at least one anion selected from agroup consisting of Cl, Br, I, F, PO₄, SO₄, NO₃, CO₃, C₂O₄, ClO₃, ClO₄,OOCCH₃, CH₃COCHCOCH₃, OCl₂, O(NO₃)₂, O(ClO₄)₂, O(SO₄), OH, O₂Cl₂, OCl₃,OOCH, OOCCH₂CH₃, C₂H₄O₄ and C₆H₅O₇. Two or more of these salts may beused at a time, as combined.

Thus obtained, in the silicate, the pore volume having a radius of 20angstroms or more, as measured according to a mercury intrusion method,is preferably 0.1 cc/g or more, more preferably from 0.3 to 5 cc/g. Thesilicate of the type contains adsorbed water and interlayer water whenprocessed in an aqueous solution. Adsorbed water as referred to hereinmeans water adsorbed to the surface or the broken crystal surface of thesilicate; and interlayer water means water existing between the layersof the crystal.

Preferably, the silicate is used here after the above-mentioned adsorbedwater and interlayer water have been removed. The dewatering method isnot specifically defined, for which usable is a method of dewateringwith heating, dewatering with heating in vapor circulation, dewateringwith heating under reduced pressure, azeotropic dewatering with organicsolvent, etc. The heating temperature may fall within a temperaturerange within which the adsorbed water and the interlayer water could notremain, and is generally 100° C. or higher, preferably 150° C. orhigher. However, a high temperature condition to cause structuraldisorder is not preferred. The heating time may be 0.5 hours or more,preferably 1 hour or more. In the case, the weight loss of the silicateafter dewatering drying is preferably 3% by weight or less, as the valuein the case of suction at a temperature of 200° C. and under a pressureof 1 mmHg, for 2 hours. In the present invention, when the silicate ofwhich the weight loss is controlled to be 3% by weight or less is usedand when the component (A) and the component (C) are kept in contactwith each other, it is desirable that the components are treated so thatthe same weight loss condition could be kept as such.

Composition of Silicate after Acid Treatment:

In the acid-treated silicate that is the component (B) in the presentinvention, it is desirable that the atomic ratio of Al/Si is from 0.01to 0.29, more preferably from 0.03 to 0.25, even more preferably from0.05 to 0.23, from the viewpoint of the activity of the polymerizationcatalyst and of the molecular weight of the olefin polymer to beproduced.

The atomic ratio of Al/Si is the index of the acid treatment intensityin the clay part. Regarding the method of controlling the atomic ratioof Al/Si, the ratio may be controlled by tailoring the type of the acidfor the acid treatment, the acid concentration, the acid treatment timeand the temperature.

Aluminium and silicon in the silicate may be determined according to amethod of preparing a calibration curve through chemical analysis basedon JIS and quantifying the atoms through fluorescent X-ray analysis.

(2-3) Component (C)

The component (C) is an optional component, an organoaluminium compoundthat is optionally used in the present invention.

One example of the organoaluminium compound is represented by thefollowing general formula [VI].AlR_(a)X_(3-a)  [VI]

In the general formula [VI], R represents a hydrocarbon group havingfrom 1 to 20 carbon atoms; X represents a hydrogen atom, a halogen atom,an alkoxy group or a siloxy group; and a indicates a number of from morethan 0 to 3.

Specific examples of the organoaluminium compound represented by thegeneral formula [VI] include trialkylaluminiums such astrimethylaluminium, triethylaluminium, tripropylaluminium,triisobutylaluminium, trihexylaluminium, trioctylaluminium, etc.;halogen- or alkoxy-containing alkylaluminiums such as diethylaluminiummonochloride, diethylaluminium monomethoxide, etc. Of those, preferredare trialkylaluminiums; and most preferred is trihexylaluminium ortrioctylaluminium. Two or more such organoaluminium compounds may beused here as combined.

(3) Catalyst Preparation Method

In the preparation method for the olefin polymerization catalyst in thepresent invention, the method of bringing the component (A), thecomponent (B) and the component (C) into contact with each other is notspecifically defined. For example, the following methods may beexemplified.

(i) The component (A) and the component (B) are brought into contact.

(ii) The component (A) and the component (B) are brought into contact,and then the component (C) is added thereto.

(iii) The component (A) and the component (C) are brought into contact,and the component (B) is added thereto.

(iv) The component (B) and the component (C) are brought into contact,and the component (A) is added thereto.

(v) The components (A), (B) and (C) are brought into contact all at atime.

In addition, the other component may be mixed in one component to be amixture, or the components may be separately brought into contact witheach other in a different order. The contact operation may be carriedout not only in catalyst preparation but also in prepolymerization withan olefin or polymerization of an olefin.

Portions of each component, as divided, may be brought into contact withanother component, for example, the component (B) and the component (C)are brought into contact and the a mixture of the component (A) and thecomponent (C) is added thereto.

Preferably, the operation of bringing the components (A), (B) and (C)into contact with each other is carried out in an inert gas such asnitrogen or the like and in an inert hydrocarbon solvent such aspentane, hexane, heptane, toluene, xylene or the like. The contactoperation may be carried out at a temperature falling within a range offrom −20° C. to the boiling point of the solvent, preferably at atemperature falling within a range of from room temperature to theboiling point of the solvent.

(3-1) Catalyst Preparation Method where a Boron Compound or anOrganoaluminiumoxy Compound is Used as the Component (B)

In the polymerization catalyst of the invention, the preferred component(B) is a boron compound or an organoaluminiumoxy compound, and is morepreferably a boron compound. In a case where the component (B) is anorganoaluminiumoxy compound, the molar ration of the component (A) tothe component (B) is from 1/0.1 to 1/100,000. In a case where thecomponent (B) is a boron compound, the molar ratio of the component (A)to the component (B) is within a range of from 1/0.1 to 1/100. In a casewhere the catalyst contains the component (C), the molar ratio of thecomponent (A) to the component (C) is preferably within a range of from1/0.1 to 1/10,000.

(3-2) Catalyst Preparation Method where a Silicate is Used as theComponent (B)

In the polymerization catalyst of the present invention where thecomponent (B) is a silicate, the preferred amount of the component (A),the component (B) and the component (C) to be used is such that that theamount of the metallocene compound of the component (A) is from 0.001 to10 mmol, more preferably from 0.001 to 1 mmol relative to 1 g of thecomponent (B). The amount of the component (C) to be sued is from 0.1 to100,000 as the molar ratio of Al/metallocene compound, preferably from 1to 10,000. The use ratio indicates an ordinary proportion example, andtherefore the above-mentioned use ratio range should not define thepresent invention so far as the catalyst meets the object of the presentinvention.

(3-3) Catalyst Preparation Method where a Particulate Carrier ExceptSilicate is Used as the Component (B)

In case where the component (B) is not a silicate, the component (A),the component (B) and/or the component (C) may be carried on aparticulate carrier except silicate for use for polymerization. Theparticulate carrier to be used includes an inorganic carrier, a granularpolymer carrier or a mixture thereof. As the inorganic carrier, usableare metals, metal oxides, metal chlorides, metal carbonates,carbonaceous substances or mixtures thereof.

Preferred metals for the inorganic carrier include, for example, iron,aluminium, nickel, etc.

As the metal oxides, there are mentioned simple oxides or compositeoxides with an element of Group 1 to Group 14 of the Periodic Table, andfor example, there are exemplified various types of natural or syntheticsimple oxides or composite oxides such as SiO₂, Al₂O₃, MgO, CaO, B₂O₃,TiO₂, ZrO₂, Fe₂O₃, Al₂O₃.MgO, Al₂O₃.CaO, Al₂O₃.S_(i)O₂, Al₂O₃.MgO.CaO,Al₂O₃.MgO.SiO₂, Al₂O₃.CuO, Al₂O₃.Fe₂O₃, Al₂O₃.NiO, SiO₂.MgO, etc.

Here, the above-mentioned formulae are not molecular formulae but aremere compositional expressions, and the structure and the componentratio of the composite oxide for use in the present invention are notspecifically defined.

The metal oxides for use in the present invention may absorb a smallamount of water with no problem, and may also contain minor impuritieswith no problem.

As the metal chlorides, for example, preferred are chlorides of alkalimetals or alkaline earth metals, and concretely, MgCl₂, CaCl₂ and thelike are especially preferred.

As the metal carbonates, preferred are carbonates of alkali metals oralkaline earth metals, and concretely, there are mentioned magnesiumcarbonate, calcium carbonate, barium carbonate, etc.

As the carbonaceous materials, for example, there are mentioned carbonblack, activated carbon, etc.

Any of the above-mentioned inorganic carriers may be favorably used inthe present invention, but especially preferred is use of metal oxides,silica, alumina, etc.

It is desirable that the inorganic carrier is, before use, fired in airor in an inert gas such as nitrogen, argon or the like, generally at 200to 800° C., preferably at 400 to 600° C. to thereby control the amountof the surface hydroxyl group to be from 0.8 to 1.5 mmol/g.

The properties of the inorganic carrier are not specifically defined.Preferred is use of inorganic carries having a mean particle size ofgenerally from 5 to 200 μm, preferably from 10 to 150 μm, a mean poresize of from 20 to 1000 angstroms, preferably from 50 to 500 angstroms,a specific surface area of from 150 to 1000 m²/g, preferably from 200 to700 m²/g, a pore volume of from 0.3 to 2.5 cm³/g, preferably from 0.5 to2.0 cm³/g, and an apparent specific gravity of from 0.20 to 0.50 g/cm³,preferably from 0.25 to 0.45 g/cm³.

Needless to say, the above-mentioned inorganic carrier may be useddirectly as it is, but as a pretreatment before use thereof, the carriermay be brought into contact with an organoaluminium compound such astrimethylaluminium, triethylaluminium, triisobutylaluminium,trihexylaluminium, tripropylaluminium, tributylaluminium,trioctylaluminium, tridecylaluminium, diisobutylaluminium hydride or thelike, or with an organoaluminiumoxy compound containing an Al—O—Al bond.

The method for bringing the components into contact with each other inproducing an olefin polymerization catalyst that comprises the component(A), a compound reacting with the component (A) to form an ion pair(component B) and a particulate carrier, is not specifically defined,for which, for example, employable is any of the following methods.

(I) The component (A) and the component (B) are brought into contactwith each other, and then with a particulate carrier.

(II) The component (A) and a particulate carrier are brought intocontact with each other, and then with the component (B).

(III) The component (B) and a particulate carrier are brought intocontact with each other, and then with the component (A).

Of those contacting methods, preferred are (I) and (III), and mostpreferred is (I). For all those contacting methods, employable is amethod of bringing the components into contact with each other generallyin an inert atmosphere such as nitrogen, argon or the like and generallyin the presence of a liquid inert hydrocarbon, for example, an aromatichydrocarbon (generally having from 6 to 12 carbon atoms) such asbenzene, toluene, xylene, ethylbenzene or the like, or an aliphatic oralicyclic hydrocarbon (generally having from 5 to 12 carbon atoms) suchas heptane, hexane, decane, dodecane, cyclohexane or the like, withstirring or not with stirring.

The contact operation may be carried out generally at a temperature offrom −100° C. to 200° C., preferably from −50° C. to 100° C., morepreferably from 0° C. to 50° C., and for from 5 minutes to 50 hours,preferably from 30 minutes to 24 hours, more preferably from 30 minutesto 12 hours.

In the step of bringing the component (A), the component (B) and aparticulate carrier into contact with each other, usable are both anaromatic hydrocarbon solvent in which some components are soluble orhardly soluble, and an aliphatic or alicyclic hydrocarbon solvent inwhich some components are insoluble or hardly soluble, as describedabove.

In a case where the contact reaction of the components is stepwisecarried out, the solvent used in the previous step is not removed butmay be directly used as the solvent in the contact reaction of thelatter stage. After the former-stage contact reaction using a solublesolvent, a liquid inert hydrocarbon solvent in which some components areinsoluble or hardly soluble (for example, aliphatic hydrocarbon,alicyclic hydrocarbon or aromatic hydrocarbon such as pentane, hexane,decane, dodecane, cyclohexane, benzene, toluene, xylene, etc.) may beadded to collect the desired product as a solid matter, and then after apart or all of the soluble solvent is removed by drying or the like totake out the desired product as the solid matter, the latter-stagecontact reaction with the desired product may be carried out using anyof the above-mentioned inert hydrocarbon solvents. The present inventiondoes not exclude any mode of carrying out the components-contactingreaction plural times.

In the present invention, the usage ratio of the component (A), thecomponent (B) and the particulate carrier is not specifically defined,but preferably falls in the range mentioned below.

In a case where an organoaluminiumoxy compound is used as the component(B), the atomic ratio of aluminium in the organoaluminiumoxy compound tothe transition metal (M) in the component (A) (Al/M) is generally from 1to 100,000, preferably from 5 to 1000, more preferably from 50 to 400.In a case where a borane compound or a borate compound is used, theatomic ratio of boron to the transition metal (M) in the component (A)(B/M) is generally from 0.01 to 100, preferably from 0.1 to 50, morepreferably from 0.2 to 10.

In a case where a mixture of an organoaluminiumoxy compound, a boranecompound and a borate compound is sued as the ion pair-forming compound(component (B)), it is desirable that the usage ratio of the constituentcomponents in the mixture to the transition metal (M) is selected in themanner as above.

The amount of the particulate carrier to be used is 1 g relative to from0.0001 to 5 mmol, preferably from 0.001 to 0.5 mmol, more preferablyfrom 0.01 to 0.1 mmol of the transition metal in the component (A).

The component (A), the component (B) and a particulate carrier arebrought into contact with each other according to any of theabove-mentioned contacting methods (I) to (III), and then the solvent isremoved or the system is washed and formed into a slurry with an inertsolvent to give an olefin polymerization catalyst as a solid catalyst.It is desirable that the solvent removal is carried out under normalpressure or under reduced pressure, at 0 to 200° C., preferably at 20 to150° C. for 1 minute to 50 hours, preferably for 10 minutes to 10 hours.

The olefin polymerization catalyst may also be obtained according to themethods mentioned below.

(IV) The component (A) and a particulate carrier are brought intocontact and the solvent is removed to give a solid catalyst component,and this is brought into contact with an organoaluminiumoxy compound, aborane compound, a borate compound or a mixture thereof underpolymerization condition.

(V) An organoaluminiumoxy compound, a borane compound, a borate compoundor a mixture thereof is brought into contact with a particulate carrierand the solvent is removed to give a solid catalyst component, and thisis brought into contact with the component (A) under polymerizationcondition.

Also in these contacting methods (IV) and (V), the same conditions asmentioned above may apply to the component ratio, the contact conditionand the solvent removal condition.

Before use of the catalyst that contains the component (A), thecomponent (B) and optionally the component (C) as the catalyst forolefin polymerization (intended polymerization), if desired, thecatalyst may be subjected to prepolymerization treatment of preliminarypolymerizing a small amount of an olefin such as ethylene, propylene,1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-butene,vinylcycloalkane, styrene or the like. For the prepolymerization, anyknown method is employable.

3. Olefin Polymerization Method

In the present invention, employable is any and every polymerizationmode that realizes efficient contact between the polymerization catalystcontaining a metallocene compound represented by the above-mentionedgeneral formula [I] and monomer for olefin polymerization orcopolymerization.

Concretely, employable here are a slurry method and a solution methodusing an inert solvent, a bulk polymerization method and a high-pressureion polymerization method substantially not using an inert solvent butusing the olefin monomer as a solvent, or a vapor-phase polymerizationmethod substantially not using a liquid solvent but keeping the monomerin a gaseous state. Preferred are solution polymerization andhigh-pressure ion polymerization.

The polymerization mode employable here may be continuous polymerizationor batch polymerization, or preliminary polymerization may be addedthereto. The combination of the polymerization modes is not specificallydefined. Employable here is any of two-stage solution polymerization,two-stage bulk polymerization, bulk polymerization followed byvapor-phase polymerization, or two-stage vapor-phase polymerization. Anymore polymerization stages are also employable for polymer production.

A component for water removal, that is, a so-called scavenger may beadded to the polymerization system with no problem.

As the scavenger of the type, usable are an organoaluminium compoundssuch as trimethylaluminium, triethylaluminium, triisobutylaluminium,trihexylaluminium, trioctylaluminium, etc.; the above-mentionedorganoaluminiumoxy compounds; modified organoaluminium compoundsprepared by modifying the above-mentioned organoaluminium compounds withalcohols or phenols; Organozinc compounds such as diethylzinc,dibutylzinc, etc.; organomagnesium compounds such as diethylmagnesium,dibutylmagnesium, ethylbutylmagnesium, etc.; Grignard compounds such asethylmagnesium chloride, butylmagnesium chloride, etc. Of those,preferred are triethylaluminium, triisobutylaluminium,trihexylaluminium, and trioctylaluminium; and more preferred aretriisobutylaluminium, trihexylaluminium and trioctylaluminium.

The molecular weight of the polymer to be produced may be controlled byvarying the polymerization conditions such as the polymerizationtemperature, the olefin monomer concentration, the molar ratio of thecatalyst, etc. Adding hydrogen, the above-mentioned scavenger or thelike as a chain transfer agent to the polymerization system effectivelyrealizes molecular weight control of the polymer.

A multi-stage polymerization system comprising two or more stages thatdiffer from each other in the polymerization conditions such as thehydrogen concentration, the monomer amount, the polymerization pressure,the polymerization temperature or the like is also applicable to thepresent invention with no problem.

(1) Polymerization Monomer

In the present invention, olefin indicates an unsaturated hydrocarbon,and “α-olefin” indicates those of such olefins where the double bond isat the α-position (between the end carbon and the next carbon).Concretely, the olefin monomer includes ethylene, propylene, 1-butene,1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-dodecene,1-hexadecene, 4-methyl-1-pentene, styrene, vinylcyclohexane, diene,triene, cyclic olefin, etc.

(2) Ethylene Homopolymerization Method and Copolymerization Method

In the present invention, more preferred polymerization using theabove-mentioned olefin polymerization catalyst is ethylenehomopolymerization or ethylene/α-olefin copolymerization. The preferredpolymerization method is a solution polymerization method using an inertsolvent, or a polymerization method not substantially using an inertsolvent but using the olefin monomer as a solvent, for example, ahigh-pressure ion polymerization method.

The polymerization temperature is generally from 0 to 300° C. In avapor-phase polymerization method, a bulk polymerization method or aslurry polymerization method, the preferred polymerization temperatureis from 40 to 120° C., more preferably from 50 to 100° C., and thepreferred polymerization pressure is from 0.1 to 10 MPa, more preferablyfrom 1 to 5 MPa.

The preferred polymerization temperature in solution polymerization isfrom 0 to 170° C., more preferably from 50 to 170° C., even morepreferably from 120 to 170° C., and the preferred polymerizationpressure is from 0.1 to 10 MPa, more preferably from 1 to 5 MPa.

The preferred polymerization temperature in high-pressure ionpolymerization is from 140 to 300° C., more preferably from 160 to 260°C., and the preferred polymerization pressure is from 40 to 150 MPa,more preferably from 50 to 100 MPa.

As obvious from Examples, the performance difference between the olefinpolymerization catalyst of the present invention and already-existingcatalysts is greater at a higher polymerization temperature especiallyin point of the molecular weight of the polymer to be produced. Inparticular, at a polymerization temperature of 120° C. or higher, theeffect is remarkable, as obvious from Examples.

α-olefins that are comonomers include those having from 3 to 20 carbonatoms, preferably from 3 to 8 carbon atoms. Concretely, there areexemplified propylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene,etc.

Two or more such α-olefins may be copolymerized with ethylene, ascombined.

The copolymerization may be any of alternate copolymerization, randomcopolymerization or block copolymerization with no problem. In a casewhere ethylene is copolymerized with any other α-olefin, the amount ofthe other α-olefin may be selected within a range of at most 90 mol % ofall monomers, but is preferably at most 50 mol %. Needless to say, it ispossible to use a small amount of any other comonomer than ethylene andα-olefin, and in this case, the additional comonomer includes aromaticvinyl compounds such as styrene, 4-methylstyrene,4-dimethylaminostyrene, etc.; dienes such as 1,4-butadiene,1,5-hexadiene, 1,4-hexadiene, 1,7-octadiene, 4-vinyl-1-cyclohexene,5-vinylnorbornene, 5-ethylidene-2-norbornene, norbornadiene, etc.;cyclic compounds such as norbornene, cyclopentene, etc.

4. Use of Olefin Polymer

The olefin copolymer produced through polymerization using themetallocene compound of the present invention has excellent mechanicalproperties, and are widely used covering from industrial-use materialsand life materials, for example, as films, sheets, fibers, nonwovenfabrics, various containers, molded articles, modifiers, etc.

Further, the low-density olefin copolymer to be obtained according tothe production method of the present invention has many branches andtherefore has excellent radical-crosslinking characteristics, and isexpected to be alternatives to crosslinked olefinic rubber (EPDM). Inother words, using the EPDM application method of 1) crosslinking therubber with an organic peroxide or sulfur serving as a crosslinkingagent, and 2) combining the rubber with any other thermoplastic resin togive a dynamically-crosslinking thermoplastic elastomer, directly as itis, the present invention realizes production of a material having acrosslinked structure. The materials obtained according to these methodshave long-lasting durability and are excellent in weather resistance andheat resistance, and therefore can be used for automobile parts,electric wires, cables, etc.

EXAMPLES

In the following, the present invention is described in more detail withreference to Examples and Comparative Examples to thereby verify theexcellence of the present invention and the superiority in theconstitution of the present invention, but the present invention is notrestricted by these Examples.

Methods for determining the physical properties of the polymers obtainedin Examples and Comparative Examples are as described below.

(1) Melt Flow Rate (MFR)

According to Table 1—Condition D in Appendix A in JIS K7210 (2004edition), the found data at a test temperature of 190° C. and under anominal load of 2.16 kg is expressed as MFR.

(2) Number-Average Molecular Weight (Mn) and Molecular WeightDistribution (Mw/Mn)

The formed ethylenic polymer was subjected to gel permeationchromatography (GPC) under the condition mentioned below, and thenumber-average molecular weight (Mn) and the weight-average molecularweight (Mw) were determined, and the molecular weight distribution(Mw/Mn) was thus calculated.

[Measurement Condition for Gel Permeation Chromatography]:

Apparatus: Waters' Alliance GPC2000 Model

Column: Shodex-HT806M

Solvent: 1,2-dichlorobenzene

Flow Rate: 1 ml/min

Temperature: 145° C.

Universal assessment was made using monodispersed polystyrene fractions.

Under the condition mentioned above, the sample was chromatographed torecord the data at sampling intervals of 1 second. Based on thechromatogram data and according to the method described in “SizeExclusion Chromatography” by Sadao Mori (Kyoritsu Publishing), Chap. 4,pp. 51-60 (1991), the differential molecular weight distribution curveand the mean molecular weight (Mn, Mw) were calculated. However, forcorrecting the molecular weight dependence of dn/dc, the height H fromthe base line in the chromatogram was corrected according to thefollowing equation.H′=[1.032+189.2/M(PE)]×H

For the molecular weight conversion from polystyrene to polyethylene,the following equation was used.M(PE)=0.468×M(PS)(3) Density

According to Method A (collecting gas over water) of the test methoddescribed in JIS K7112 (2004 edition), the density was measured.

(4) Comonomer Content

The monomer composition of ethylene/1-hexene copolymer was analyzedthrough NMR according to the description in a publication (Anal. Chem.,2004, 5734-5747).

[NMR Measurement Condition]

As the solvent, used was a mixture solvent of 1,2-dichlorobenzene/heavybromobenzene (4/1). The sample concentration was 150 mg/2.4 mL. Thesample was introduced into an NMR sample tube, then fully purged withnitrogen, and dissolved in a heat block at 130° C. to give a uniformsolution. Using Bruker Avance III Cryo-NMR with a 10 mmφ cryoprobe, thesample was analyzed at 130° C.

The measurement condition was as follows. ¹H-NMR: solvent presaturationmethod, 18° pulse, number of integration frequencies 256, ¹³C-NMR:proton complete decoupling condition, 90° pulse, number of integrationfrequencies 512.

(5) Melting Point (T_(m))

Using Seiko Electronics' EXSTAR6000, DSC differential scanningcalorimeter, the sample (about 5 mg) was melted at 180° C. for 5minutes, then cooled to −20° C. at a rate of 10° C./min, kept at −20° C.for 5 minutes, and thereafter heated up to 180° C. at a rate of 10°C./min to provide a melting curve of the sample. The peak toptemperature of the main endothermic peak in the final heating stage toprovide the melting curve was referred to as the melting point T_(m) ofthe sample.

The molecular weight of the polymer obtained herein can be evaluatedaccording to the above-mentioned measurements (1) and (2). In otherwords, the polymer of which the value of MFR determined in themeasurement (1) is smaller, and the polymer of which the number-averagemolecular weight determined in the measurement (2) is larger can be saidto be polymers having a higher molecular weight.

In addition, the comonomer content in the copolymer obtained herein,concretely, the content of 1-hexene that is α-olefin in the copolymerobtained in Examples and Comparative Examples can be evaluated accordingto the above-mentioned measurements (3) and (4). The polymer of whichthe value of the density determined in the measurement (3) is smaller,and the polymer of which the hexene content determined in (4) is largercan be said to be polymers having a higher comonomer content. In otherwords, it may be said that the polymer obtained using a differentcatalyst and at the same temperature and in the same monomer ratio andhaving a smaller density or having a higher hexene content is excellentin copolymerizability (excellent in the performance of efficientlytaking in the comonomer).

<1> Synthesis of Metallocene Compound Synthesis of metallocene compoundA: isopropylidenebis(4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound A (1) Synthesis of 4-phenyl-indene

This was synthesized according to the method described in JP-A2008-101034.

(2) Synthesis of 2,2-bis(4-phenyl-inden-1-yl)propane

1.00 g (5.21 mmol) of 4-phenyl-1-indene, 10 mL of 1,2-dimethoxyethane(DME) and 0.583 g (10.4 mmol) of potassium hydroxide were put in a100-mL glass reactor, and heated under reflux at 90° C. for 1 hour. Thereaction liquid was cooled to 0° C., then 0.151 g (2.60 mmol) of acetonewas added thereto and heated under reflux at 90° C. for 6 hours. Thereaction liquid was cooled to room temperature, then 20 mL of distilledwater was added thereto, transferred into a separatory funnel, extractedthree times with ethyl acetate, and dried with sodium sulfate. Sodiumsulfate was filtered away, the solvent was evaporated away under reducedpressure, and the resultant crude product was purified through silicagel column chromatography (developing solvent, dichloromethane/petroleumether=1/20) to give 0.45 g (yield 41%) of2,2-bis(4-phenyl-inden-1-yl)propane as a pale yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ7.52 (dd, 4H), 7.44 (t, 4H), 7.41-7.34 (m,4H), 7.16 (t, 2H), 7.11 (dd, 2H), 6.59 (t, 2H), 3.48 (d, 2H), 1.81 (s,6H).

(3) Synthesis of isopropylidenebis(4-phenyl-1-indenium)hafniumdichloride

1.50 g (3.5 mmol) of 2,2-bis(4-phenyl-inden-1-yl)propane was put in a200-mL three-neck flask having a rotor set therein and equipped with athree-way cock and a thermometer, and 70 ml of toluene and 15 ml ofdiethyl ether were added thereto to dissolve the compound. This wascooled to −70° C. in a dry ice-isopropyl alcohol bath, and 4.7 ml (7.5mmol) of n-butyllithium/hexane (1.59 M solution) was added thereto andstirred for 40 minutes. The cooling bath was removed, and the mixturewas heated up to 20° C., kept as such for 1 hour, and then the solventwas evaporated away. 70 mL of toluene and 3 mL of diethyl ether wereadded thereto to dissolve the mixture, and cooled to −70° C. 1.25 g (3.9mmol) of hafnium tetrachloride was added, and immediately the coolingbath was removed, and the mixture was gradually restored to roomtemperature. From ¹H-NMR thereof, the stereoisomeric composition of theresultant complex was racemic form/meso form=33/67. The solvent wasevaporated away, 60 ml of DME was added to the residue and heated withstirring at 60° C. for 3 hours. Through the operation, thestereoisomeric composition of the complex became racemic form/mesoform=93/7. The supernatant was removed through decantation, then theprecipitate was dissolved in dichloromethane, and the insoluble matterwas removed through filtration. The filtrate was concentrated, theresultant solid was washed with a small amount of toluene, and thendried under reduced pressure to giveisopropylidenebis(4-phenyl-1-indenium)hafnium dichloride as a yellowpowdery solid. The racemic form purity of the product was 100%, and theyield thereof was 1.25 g, and 53%.

¹H-NMR (400 MHz, CDCl₃): δ7.78 (d, J=8.8 Hz, 2H), 7.57 (dd, J=8.3 Hz,4H), 7.42 (t, J=7.1 Hz, 4H), 7.34 (t, J=7.3 Hz, 2H), 7.26 (d, J=6.3 Hz,2H), 7.13-7.09 (m, 2H), 6.72 (dd, J=3.6 Hz, 2H), 6.18 (d, J=3.6 Hz, 2H),2.41 (s, 6H).

(4) Synthesis of isopropylidenebis(4-phenyl-1-indenyl)dimethylhafnium

0.51 g (0.76 mmol) of isopropylidenebis(4-phenyl-1-indenium)hafniumdichloride and 40 ml of toluene were put in a 100-mL side-arm flaskhaving a rotor set therein, and dissolved. This was cooled to 0° C. inan ice bath, 1.8 mL (5.4 mmol) of methylmagnesium bromide/diethyl ether(3.0 M solution) was added, and then heated with stirring at 40° C. for11 hours. At room temperature, 0.47 ml (3.7 mmol) of trimethylsilylchloride was added, stirred for 30 minutes, and 10 ml of dioxane wasadded and stirred for 30 minutes. The insoluble matter was removedthrough filtration, and the filtrate was concentrated to give a yellowsolid. This was washed with a small amount of hexane, then thesupernatant was removed through decantation, and the residue was driedunder reduced pressure to give a pale yellow powdery solid ofisopropylidenebis(4-phenyl-1-indenyl)dimethylhafnium. The racemic formpurity of the compound was 100%, the yield thereof was 0.32 g and 66%.

¹H-NMR (400 MHz, C₆D₆): δ7.69 (dd, J=8.4 Hz, 4H), 7.35 (d, J=9.0 Hz,2H), 7.22 (t, J=7.6 Hz, 4H), 7.15-7.09 (m, 4H), 6.84-6.80 (m, 4H), 5.57(d, J=3.5 Hz, 2H), 1.77 (s, 6H), −0.99 (s, 6H).

Synthesis of metallocene compound B:di-n-propylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound B (1) Synthesis of4,4-bis(4-phenyl-inden-1-yl)heptane

25.0 g (130 mmol) of 4-phenyl-1-indene, 200 mL of DME, and 14.6 g (260mmol) of potassium hydroxide were put in a 100-mL glass reactor, andheated under reflux at 90° C. for 1 hour. The reaction liquid was cooledto 0° C., then 7.42 g (65.1 mmol) of 4-heptanone was added thereto andheated under reflux at 90° C. for 15 hours. The reaction liquid wascooled to room temperature, then 150 mL of distilled water was addedthereto, transferred into a separatory funnel, extracted three timeswith ethyl acetate, and dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent was evaporated away under reduced pressure,and the resultant crude product was purified through silica gel columnchromatography (developing solvent, petroleum ether) to give 7.0 g(yield 24%) of 4,4-bis(4-phenyl-inden-1-yl)heptane as a pale yellowsolid.

¹H-NMR (400 MHz, CDCl₃): δ7.54 (dd, 4H), 7.45 (t, 4H), 7.40-7.30 (m,4H), 7.12-7.05 (m, 4H), 6.63 (s, 2H), 3.51 (d, 4H), 2.25-2.17 (m, 4H),1.22-1.08 (m, 4H), 0.89 (t, 6H).

(2) Synthesis of di-n-propylmethylenebis(4-phenyl-1-indenyl)hafniumdichloride

3.00 g (6.2 mmol) of 4,4-bis(4-phenyl-inden-1-yl)heptane was put in a200-mL three-neck flask having a rotor set therein and equipped with athree-way cock and a thermometer, and 60 ml of toluene and 50 ml ofdiethyl ether were added thereto to dissolve the compound. This wascooled to −70° C. in a dry ice-isopropyl alcohol bath, and 9.2 ml (14.9mmol) of n-butyllithium/hexane (1.63 M solution) was added thereto andstirred for 60 minutes. The cooling bath was removed, and the mixturewas restored to room temperature, and the solvent was evaporated away.100 mL of toluene and 5 mL of diethyl ether were added thereto todissolve the mixture, and cooled to −70° C. 2.29 g (7.2 mmol) of hafniumtetrachloride was added, and immediately the cooling bath was removed,and the mixture was gradually restored to room temperature. From ¹H-NMRthereof, the stereoisomeric composition of the resultant complex wasracemic form/meso form=38/62. The solvent was evaporated away, 110 ml ofDME was added to the residue and heated with stirring at 50° C. for 7hours. The solvent was evaporated away, 130 ml of toluene was added tothe residue to dissolve it, and the insoluble matter was removed throughfiltration. The filtrate was concentrated, the resultant solid waswashed with a small amount of hexane, and then dried under reducedpressure to give di-n-propylmethylenebis(4-phenyl-1-indenyl)hafniumdichloride as a yellow powdery solid. The racemic form purity of theproduct was 100%, and the yield thereof was 0.57 g, and 13%.

¹H-NMR (400 MHz, CDCl₃): δ7.62 (d, J=8.8 Hz, 2H), 7.57 (dd, J=8.4 Hz,4H), 7.42 (t, J=7.2 Hz, 4H), 7.34 (t, J=7.2 Hz, 2H), 7.25 (d, 2H),7.14-7.10 (m, 2H), 6.72 (dd, J=3.6 Hz, 2H), 6.23 (d, J=3.6 Hz, 2H),2.96-2.85 (m, 2H), 62.67-1.97 (m, 2H), 1.91-1.75 (m, 4H), 1.23 (t, J=7.2Hz, 6H).

(3) Synthesis ofdi-n-propylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium

0.57 g (0.78 mmol) of di-n-propylmethylenebis(4-phenyl-1-indenyl)hafniumdichloride and 30 ml of toluene were put in a 100-mL side-arm flaskhaving a rotor set therein, and dissolved. 2.7 mL (8.1 mmol) ofmethylmagnesium bromide/diethyl ether (3.0 M solution) was added, andthen heated with stirring at 50° C. for 5 hours. At room temperature,0.79 ml (6.3 mmol) of trimethylsilyl chloride was added, stirred for 30minutes, and 5 ml of dioxane was added and stirred for 30 minutes. Theinsoluble matter was removed through filtration, and the filtrate wasconcentrated to give a yellow solid. This was washed with a small amountof hexane, then the supernatant was removed through decantation, and theresidue was dried under reduced pressure to give a pale yellow powderysolid of di-n-propylmethylenebis(4-phenyl-1-indenyl)dimethylhafnium. Theracemic form purity of the compound was 100%, the yield thereof was 0.28g and 53%.

¹H-NMR (400 MHz, C₆D₆): δ7.69 (dd, J=8.4 Hz, 4H), 7.35 (d, J=8.8 Hz,2H), 7.23 (t, J=7.2 Hz, 4H), 7.15-7.09 (m, 4H), 6.88-6.83 (m, 4H), 5.73(d, J=3.6 Hz, 2H), 2.55-2.44 (m, 2H), 2.25-2.15 (m, 2H), 1.66-1.50 (m,4H), 61.03 (t, J=7.2 Hz, 6H), −0.97 (s, 6H).

Synthesis of metallocene compound C:cyclobutylidenebis(4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound C (1) Synthesis of1,1-bis(4-phenyl-inden-1-yl)cyclobutane

22.4 g (116 mmol) of 4-phenylindene, 150 mL of DME, and 13.0 g (233mmol) of potassium hydroxide were put in a 500-mL glass reactor, andheated under reflux at 90° C. for 1 hour. The reaction liquid was cooledto 0° C., then 4.00 g (57.2 mmol) of cyclobutanone was added thereto andheated under reflux at 90° C. for 10 hours. The reaction liquid wascooled to room temperature, then 200 mL of distilled water was addedthereto, transferred into a separatory funnel, extracted three timeswith ethyl acetate, and dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent was evaporated away under reduced pressure,and the resultant crude product was purified through silica gel columnchromatography (developing solvent, petroleum ether) to give 10.0 g(yield 40%) of 1,1-bis(4-phenyl-inden-1-yl)cyclobutane as a pale yellowsolid.

¹H-NMR (400 MHz, CDCl₃): δ7.51 (dd, 4H), 7.46-7.39 (m, 6H), 7.36-7.22(m, 2H), 7.24 (t, 2H), 7.14 (dd, 2H), 6.07 (t, 2H), 3.49 (d, 4H), 2.78(t, 4H), 2.11 (quint, 2H).

(2) Synthesis of racemic cyclobutylidenebis(4-phenyl-1-indenyl)hafniumdichloride

4.37 g (10.0 mmol) of 1,1-bis(4-phenyl-inden-1-yl)cyclobutane and 100 mlof diethyl ether were put in a 300-mL glass reactor, and cooled to −70°C. in a dry ice-heptane bath. 12.8 ml (20.4 mmol) ofn-butyllithium/n-hexane solution (1.59 mol/L) was dropwise added theretoand stirred at room temperature for 4 hours. The solvent was evaporatedaway under reduced pressure from the reaction liquid, then 100 ml oftoluene was added, and cooled to −70° C. in a dry ice-heptane bath. 3.20g (10.0 mmol) of hafnium chloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 17 hours.In this stage, the ratio of the racemic form to the meso form of theresultant compound was 48/52.

The solvent was evaporated away under reduced pressure from the reactionliquid, 26 mL of DME was added thereto, and stirred at 60° C. for 5hours. The reaction liquid was cooled to room temperature, then filteredthrough glass frit, and the solid was washed twice with 3 mL of DME. Theresultant crude product was extracted with 150 mL of dichloromethane,filtered through Celite, and the solvent was evaporated away underreduced pressure to give 4.84 g (yield 71%) of a racemic form of racemic1,1-cyclobutylidenebis(4-phenylindenyl)hafnium dichloride as an orangesolid.

¹H-NMR (400 MHz, CDCl₃): δ=7.57 (d, 4H), 7.52 (d, 2H), 7.42 (t, 4H),7.35 (t, 2H), 7.27 (d, 2H), 7.09 (dd, 2H), 6.66 (d, 2H), 6.07 (d, 2H),3.60 (quartet, 2H), 3.17 (quartet, 2H), 2.49 (quintet, 2H).

(3) Synthesis of racemiccyclobutylidenebis(4-phenyl-1-indenyl)dimethylhafnium

1.50 g (2.19 mmol) of 1,1-cyclobutylidenebis(4-phenylindenyl)hafniumdichloride and 60 ml of toluene were put in a 100-mL glass reactor. 6.55mL (19.7 mmol) of methylmagnesium bromide/diethyl ether solution (3.0mol/L) was dropwise added thereto at room temperature, and stirred at80° C. for 5 hours. The reaction liquid was cooled to 0° C. in an icebath, then 2.4 mL (19.0 mmol) of chlorotrimethylsilane was addedthereto, stirred at room temperature for 30 minutes, and subsequently5.0 mL (58.4 mmol) of 1,4-dioxane was added, and further stirred at roomtemperature for 30 minutes. The suspension was filtered through Celite,the solvent was evaporated away under reduced pressure, and theresultant yellow solid was suspended in 5 mL of hexane, filtered throughglass frit, and the solid was further washed twice with 5 mL of hexaneto give 1.37 g (97%) of a racemic form of racemiccyclobutylidenebis(4-phenyl-1-indenyl)dimethylhafnium as a yellow solid.

¹H-NMR (400 MHz, C₆D₆): δ7.70 (dd, 4H), 7.23 (t, 4H), 7.18-7.08 (m, 6H),6.80 (dd, 2H), 6.78 (d, 2H), 5.52 (d, 2H), 3.05 (quartet, 2H), 2.60(quartet, 2H), 2.07 (quintet, 2H), −1.02 (s, 6H).

Synthesis of metallocene compound D:cyclopentylidenebis(4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound D (1) Synthesis of1,1-bis(4-phenylinden-1-yl)cyclopentane

25.0 g (130 mmol) of 4-phenyl-indene, 200 mL of DME, and 14.6 g (260mmol) of potassium hydroxide were put in a 100-mL glass reactor, andheated under reflux at 90° C. for 1 hour. The reaction liquid was cooledto 0° C., then 4.94 g (58.6 mmol) of cyclopentanone was added theretoand heated under reflux at 90° C. for 6 hours. The reaction liquid wascooled to room temperature, then 150 mL of distilled water was addedthereto, transferred into a separatory funnel, extracted three timeswith dichloromethane, and dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent was evaporated away under reduced pressure,and the resultant crude product was purified through silica gel columnchromatography (developing solvent, petroleum ether) to give 9.0 g(yield 31%) of 1,1-bis(4-phenylinden-1-yl)cyclopentane as a pale yellowsolid.

¹H-NMR (400 MHz, CDCl₃): δ7.52 (m, 6H), 7.44 (t, 4H), 7.36 (t, 2H), 7.21(t, 2H), 7.12 (d, 2H), 6.60 (s, 2H), 3.47 (d, 4H), 2.43 (t, 4H), 1.84(quint, 4H).

(2) Synthesis of cyclopentylidenebis(4-phenyl-1-indenyl)hafniumdichloride

2.50 g (5.6 mmol) of 1,1-bis(4-phenylinden-1-yl)cyclopentane, 20 mL oftoluene and 20 mL of diethyl ether were put in a 100-mL three-neck flaskhaving a rotor set therein and equipped with a three-way cock and athermometer, and dissolved. This was cooled to −70° C. in a dryice-isopropyl alcohol bath, and 7.2 ml (11.8 mmol) ofn-butyllithium/hexane (1.64 M solution) was added thereto and stirredfor 90 minutes. The cooling bath was removed, and the mixture wasrestored to room temperature, and the solvent was evaporated away underreduced pressure. 30 mL of toluene and 1.5 mL of diethyl ether wereadded thereto to dissolve the mixture, and cooled to −70° C. 1.79 g (5.6mmol) of hafnium tetrachloride was added, and immediately the coolingbath was removed, and the mixture was gradually restored to roomtemperature. From ¹H-NMR thereof, the stereoisomeric composition of theresultant complex was racemic form/meso form=33/67. The solvent wasevaporated away, 30 ml of DME was added to the residue and heated withstirring at 60° C. for 11 hours. The supernatant was collected throughdecantation. 40 mL of DME was added to the resultant residue, heated at60° C. for 3 hours, the supernatant was collected through decantationand combined with the previously-collected liquid, and the solvent wasevaporated away. 45 mL of toluene was added and heated at 40° C., andthe insoluble matter was removed through hot filtration. The filtratewas concentrated to be 20 mL, then 5 mL of hexane was added and cooledto −20° C., and the precipitated yellow powdery solid was collected. Thesolid was washed with a small amount of hexane, and dried under reducedpressure to give a yellow powdery solid of1,1-cyclopentylidenebis(4-phenyl-1-indenyl)hafnium dichloride. Theracemic purity of the compound was 100%, and the yield thereof was 0.55g and 14%.

¹H-NMR (400 MHz, CDCl₃): δ7.70 (d, J=8.8 Hz, 4H), 7.57 (dd, J=8.3 Hz,4H), 7.41 (t, J=7.0 Hz, 4H), 7.34 (t, J=7.3 Hz, 4H), 7.26 (dd, J=6.8 Hz,4H), 7.12-7.08 (m, 2H), 6.69 (dd, J=3.6 Hz, 2H), 6.15 (d, J=3.5 Hz, 2H),3.16-3.09 (m, 2H), 2.95-2.88 (m, 2H), 2.19-1.99 (m, 4H).

(3) Synthesis of cyclopentylidenebis(4-phenyl-1-indenyl)dimethylhafnium

0.50 g (0.72 mmol) of cyclopentylidenebis(4-phenyl-1-indenyl)hafniumdichloride and 30 ml of toluene were put in a 100-mL side-arm flaskhaving a rotor set therein, and dissolved. 2.4 mL (7.2 mmol) ofmethylmagnesium bromide/diethyl ether (3.0 M solution) was added, andthen heated with stirring at 50° C. for 7 hours. At room temperature,0.70 ml (5.5 mmol) of trimethylsilyl chloride was added, stirred for 30minutes, and 5 ml of dioxane was added and stirred for 30 minutes. Theinsoluble matter was removed through filtration, and the filtrate wasconcentrated to give a yellow solid. This was washed with a small amountof hexane, then the supernatant was removed through decantation, and theresidue was dried under reduced pressure to give a pale yellow powderysolid of 1,1-cyclopentylidenebis(4-phenyl-1-indenyl)dimethylhafnium. Theracemic form purity of the compound was 100%, the yield thereof was 0.32g and 68%.

¹H-NMR (400 MHz, C₆D₆): δ7.69 (d, J=8.0 Hz, 4H), 7.28 (d, J=9.2 Hz, 2H),7.22 (t, J=7.2 Hz, 4H), 7.13-7.08 (m, 4H), 6.83-6.78 (m, 4H), 5.57 (d,J=3.6 Hz, 2H), 2.60-2.51 (m, 2H), 2.34-2.26 (m, 2H), 1.80-1.62 (m, 4H),−0.99 (s, 6H).

Synthesis of metallocene compound E:cyclohexylidenebis(4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound E (1) Synthesis of1,1-bis(4-phenylindenyl-1-yl)cyclohexane

25.0 g (130 mmol) of 4-phenylindene, 200 mL of DME, and 14.6 g (260mmol) of potassium hydroxide were put in a 100-mL glass reactor, andheated under reflux at 90° C. for 1 hour. The reaction liquid was cooledto 0° C., then 6.38 g (65.1 mmol) of cyclohexanone was added thereto andheated under reflux at 90° C. for 6 hours. The reaction liquid wascooled to room temperature, then 150 mL of distilled water was addedthereto, transferred into a separatory funnel, extracted three timeswith dichloromethane, and dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent was evaporated away under reduced pressure,and the resultant crude product was purified through silica gel columnchromatography (developing solvent, petroleum ether) to give 9.0 g(yield 30%) of 1,1-bis(4-phenylinden-1-yl)cyclohexane as a pale yellowsolid.

¹H-NMR (400 MHz, CDCl₃): δ7.51 (m, 6H), 7.44 (t, 4H), 7.36 (t, 2H), 7.16(t, 2H), 7.09 (d, 2H), 6.73 (s, 2H), 3.49 (d, 4H), 2.45 (m, 4H), 1.71(brs, 4H), 1.58 (m, 4H).

(2) Synthesis of cyclohexylidenebis(4-phenyl-1-indenyl)hafniumdichloride

3.00 g (6.5 mmol) of 1,1-bis(4-phenylinden-1-yl)cyclohexane was put in a200-mL three-neck flask having a rotor set therein and equipped with athree-way cock and a thermometer, and 40 mL of toluene and 30 mL ofdiethyl ether were added thereto to dissolve the compound. This wascooled to −70° C. in a dry ice-isopropyl alcohol bath, and 8.4 ml (13.8mmol) of n-butyllithium/hexane (1.64 M solution) was added thereto andstirred for 60 minutes. The cooling bath was removed, and the mixturewas restored to room temperature, and the solvent was evaporated awayunder reduced pressure. 50 mL of toluene and 3 mL of diethyl ether wereadded thereto to dissolve the mixture, and cooled to −70° C. 2.09 g (6.5mmol) of hafnium tetrachloride was added, and immediately the coolingbath was removed, and the mixture was gradually restored to roomtemperature. From ¹H-NMR thereof, the stereoisomeric composition of theresultant complex was racemic form/meso form=24/76. The solvent wasevaporated away, 150 ml of DME was added to the residue and heated withstirring at 60° C. for 13 hours. The supernatant was collected throughdecantation. 100 mL of DME was added to the resultant residue, heated at60° C. for 5 hours, the supernatant was collected through decantationand combined with the previously-collected liquid, and the solvent wasevaporated away. 80 mL of toluene was added, and the insoluble matterwas removed through filtration. The filtrate was concentrated and cooledto −20° C., and the precipitated yellow powdery solid was collected. Thesolid was washed with a small amount of hexane, and dried under reducedpressure to give cyclohexylidenebis(4-phenyl-1-indenyl)hafniumdichloride. The racemic purity of the compound was 100%, and the yieldthereof was 0.46 g and 10%.

¹H-NMR (400 MHz, CDCl₃): δ7.72 (d, J=8.8 Hz, 2H), 7.58 (dd, J=8.4 Hz,4H), 7.42 (t, J=7.2 Hz, 4H), 7.35 (t, J=7.2 Hz, 2H), 7.26 (d, J=6.4 Hz,2H), 7.13-7.09 (m, 2H), 6.74 (dd, J=3.6 Hz, 2H), 6.20 (d, J=3.6 Hz, 2H),3.02-2.87 (m, 4H), 2.03-1.94 (m, 4H), 1.82-1.74 (m, 2H).

(3) Synthesis of cyclohexylidenebis(4-phenyl-1-indenyl)dimethylhafnium

0.46 g (0.64 mmol) of cyclohexylbis(4-phenylindenyl)hafnium dichlorideand 30 ml of toluene were put in a 100-mL side-arm flask having a rotorset therein, and dissolved. 2.2 mL (6.6 mmol) of methylmagnesiumbromide/diethyl ether (3.0 M solution) was added, and then heated withstirring at 50° C. for 4 hours. At room temperature, 0.64 ml (5.1 mmol)of trimethylsilyl chloride was added, stirred for 30 minutes, and 5 mlof dioxane was added and stirred for 30 minutes. The insoluble matterwas removed through filtration, and the filtrate was concentrated togive a yellow solid. This was washed with a small amount of hexane, thenthe supernatant was removed through decantation, and the residue wasdried under reduced pressure to give a pale yellow powdery solid ofcyclopentylidenebis(4-phenyl-1-indenyl)dimethylhafnium. The racemic formpurity of the compound was 100%, the yield thereof was 0.25 g and 59%.

¹H-NMR (400 MHz, C₆D₆): δ7.70 (dd, J=8.3 Hz, 4H), 7.30 (d, J=8.8 Hz,2H), 7.23 (t, J=7.6 Hz, 4H), 7.14-7.09 (m, 4H), 6.86-6.82 (m, 4H), 5.57(d, J=3.6 Hz, 2H), 2.42-2.27 (m, 4H), 1.69-1.62 (m, 4H), 1.51-1.43 (m,2H), −0.99 (s, 6H).

Synthesis of metallocene compound F:isopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound F (1) Synthesis of 4-(4-isopropylphenyl)indene

38 g (180 mmol) of tripotassium phosphate, 100 mL of distilled water,100 mL of DME, 11 g (67.1 mmol) of 4-isopropylphenylboronic acid, 11.0 g(56.4 mmol) of 7-bromo-1H-indene, 323 mg (0.460 mmol) ofdichlorobis(triphenylphosphine)palladium, and 432 mg (1.65 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 8 hours. This was left cooledto room temperature, then the reaction liquid was poured into 100 mL ofdistilled water, transferred into a separatory funnel, and extractedthree times with hexane. At room temperature 5 mL of concentratedhydrochloric acid was added to the hexane solution, then stirred at roomtemperature for 30 minutes, the palladium compound was precipitated,filtered out through filter paper, and the filtrate was washed threetimes each with saturated saline water and distilled water, and driedwith sodium sulfate. Sodium sulfate was filtered away, the solvent wasevaporated away under reduced pressure, and the residue was purifiedthrough silica gel column chromatography (developing solvent,hexane/diisopropyl ether=20/1) to give 13.2 g (yield 100%) of4-(4-isopropylphenyl)indene as a pale red oil.

(2) Synthesis of 2,2-bis(4-(4-isopropylphenyl)-inden-1-yl)propane

13.18 g (56.2 mmol) of 4-(4-isopropylphenyl)indene, 85 mL of DME, and4.26 g (75.9 mmol) of potassium hydroxide were put in a 200-mL glassreactor, and heated under reflux at 90° C. for 2 hours. The reactionliquid was cooled to 0° C., then 2.1 mL (28.6 mmol) of acetone was addedthereto and heated under reflux at 90° C. for 6 hours. The reactionliquid was cooled to room temperature, then 100 mL of distilled waterwas added thereto, cooled to 0° C. in an ice bath, 6 mL of concentratedhydrochloric acid was added thereto, and stirred at room temperature for15 minutes. The reaction liquid was transferred into a separatoryfunnel, extracted three times with diisopropyl ether, and the resultantdiisopropyl ether solution as washed three times each with saturatedsaline water and distilled water, and dried with sodium sulfate. Sodiumsulfate was filtered away, the solvent was evaporated away under reducedpressure, and the resultant solid was washed with 30 mL of hexane, anddried in vacuum to give 10.3 g (yield 72%) of2,2-bis(4-(4-isopropylphenyl)-inden-1-yl)propane as a pale yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ 7.45 (d, 4H), 7.36 (d, 2H), 7.30 (d, 4H),7.13 (t, 2H), 7.10 (d, 2H), 6.57 (t, 2H), 3.49 (d, 2H), 2.97 (sept, 2H),1.79 (s, 6H), 1.31 (d, 2H).

(3) Synthesis ofracemic-isopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]hafniumdichloride

3.56 g (7.00 mmol) of 2,2-bis(4-(4-isopropylphenyl)-inden-1-yl)propaneand 70 ml of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 8.7 mL (14.4 mmol) ofn-butyl lithium/n-hexane solution (1.65 mol/L) was dropwise addedthereto, and stirred at room temperature for 4 hours. The solvent wasevaporated away under reduced pressure from the reaction liquid, 80 mLof toluene was added, and cooled to −70° C. in a dry ice/heptane bath.2.24 g (6.99 mmol) of hafnium tetrachloride was added thereto.Subsequently, while gradually restored to room temperature, this wasstirred for 17 hours. The ratio of the racemic form to the meso formformed in this stage was 2/8.

The solvent was evaporated away under reduced pressure from the reactionliquid, 60 mL of DME was added, and stirred at 60° C. for 4 hours. Thereaction liquid was cooled to room temperature, then filtered throughglass frit, and the solid was collected through filtration to give 4.32g of a racemic form ofisopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]hafnium dichloridecontaining lithium chloride, as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.76 (d, 2H), 7.52 (d, 4H), 7.28 (d, 4H),7.25 (d, 2H), 7.09 (dd, 2H), 6.75 (d, 2H), 6.16 (d, 2H), 2.92 (sep, 2H),2.40 (s, 6H), 1.26 (d, 12H).

(4) Synthesis ofracemic-isopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]hafnium dichloride(the content is 1.32 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.1 mL (9.3 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 80° C. for 4 hours. The reaction liquidwas cooled to 0° C. in an ice bath, then 0.84 mL (6.65 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for20 minutes, and subsequently 1.70 mL (19.9 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 30 minutes. Thesuspension was filtered through Celite, the solvent was evaporated awayunder reduced pressure, and the resultant yellow solid was suspended in10 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 5 mL of hexane to give 702 mg of a racemic formof isopropylidenebis[4-(4-isopropylphenyl)-1-indenyl]dimethylhafnium asa yellow solid. The yield based on the ligand was 61% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.74 (d, 4H), 7.37 (d, 2H), 7.21 (d, 2H), 7.17(d, 4H), 6.90 (d, 2H), 6.86 (dd, 2H), 5.59 (d, 2H), 2.71 (sep, 2H), 1.80(s, 6H), 1.13 (d, 12H), −0.90 (s, 6H).

Synthesis of metallocene compound G:isopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound G (1) Synthesis of 4-(3,5-dimethylphenyl)indene

This was synthesized according to the method described in JP-A2008-101034.

(2) Synthesis of 2,2-bis(4-(3,5-dimethylphenyl)-inden-1-yl)propane

24.4 g (111 mmol) of 4-(3,5-dimethylphenyl)indene, 200 mL of DME and12.4 g (222 mmol) of potassium hydroxide were put in a 500-mL glassreactor, and heated under reflux at 90° C. for 1 hour. The reactionliquid was cooled to 0° C., then 3.22 g (55.5 mmol) of acetone was addedthereto and heated under reflux at 90° C. for 6 hours. The reactionliquid was cooled to room temperature, then 200 mL of distilled waterwas added thereto, and the resultant suspension was filtered throughfilter paper, and the solid on the filter paper was washed twice with 50mL of petroleum ether. The resultant crude product was purified throughsilica gel column chromatography (developing solvent,dichloromethane/petroleum ether=1/20) to give 10.0 g (yield 37%) of2,2-bis(4-(3,5-dimethylphenyl)-inden-1-yl)propane as a gray solid.

¹H-NMR (400 MHz, CDCl₃): δ7.35 (dd, 2H), 7.14 (t, 2H), 7.14 (s, 4H),7.09 (d, 2H), 7.01 (s, 2H), 6.57 (s, 2H), 3.48 (d, 4H), 2.39 (s, 12H),1.80 (s, 6H).

(3) Synthesis ofracemic-isopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafniumdichloride

2.40 g (5.00 mmol) of 2,2-bis(4-(3,5-dimethylphenyl)-inden-1-yl)propaneand 50 mL of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 6.2 mL (10.2 mmol) ofn-butyllithium-n-hexane solution (1.64 mol/L) was dropwise addedthereto, and stirred at room temperature for 4 hours. The solvent wasevaporated away from the reaction liquid under reduced pressure, 50 mLof toluene was added thereto, and cooled to −70° C. in a dry ice-heptanebath. 1.60 g (5.00 mmol) of hafnium tetrachloride was added thereto.Subsequently, while gradually restored to room temperature, this wasstirred for 18 hours. The ratio of the racemic form to the meso formformed in this stage was 47/53.

The solvent was evaporated away under reduced pressure from the reactionliquid, 20 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was cooled to room temperature, then filtered throughglass frit, and the solid was washed twice with 5 mL of DME to give 3.07g of a racemic form ofisopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafnium dichloride,as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.74 (d, 2H), 7.24 (d, 2H), 7.21 (s, 4H),7.07 (dd, 2H), 6.98 (s, 2H), 6.74 (d, 2H), 6.17 (d, 2H), 2.39 (s, 6H),2.32 (s, 12H).

(4) Synthesis ofracemic-isopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafnium dichloride(the content is 1.37 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.2 mL (9.6 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 80° C. for 2 hours. The reaction liquidwas cooled to 0° C. in an ice bath, then 0.87 mL (6.9 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for10 minutes, and subsequently 1.75 mL (20.5 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 1.5 hours. Thesuspension was filtered through Celite, the solvent was evaporated awayunder reduced pressure, and the resultant yellow solid was suspended in10 mL of hexane, filtered through glass frit, and the solid was furtherwashed twice with 3 mL of hexane to give 593 mg of a racemic form ofisopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafnium as ayellow solid. The yield based on the ligand was 53% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.44 (s, 4H), 7.39 (d, 2H), 7.23 (d, 2H), 6.92(d, 2H), 6.88 (dd, 2H), 6.81 (s, 2H), 5.65 (d, 2H), 2.15 (s, 12H), 2.32(s, 6H), −0.88 (s, 6H).

Synthesis of metallocene compound H:isopropylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound H (1) Synthesis of2,2-bis(4-bromo-inden-1-yl)propane

20.0 g (103 mmol) of 4-bromophenylindene, 200 mL of DME and 12.0 g (206mmol) of potassium hydroxide were put in a 500-mL glass reactor, andheated under reflux at 90° C. for 1 hour. The reaction liquid was cooledto 0° C., then 3.00 g (52.0 mmol) of acetone was added thereto andheated under reflux at 90° C. for 4 hours. The reaction liquid wascooled to room temperature, and the solvent was evaporated away underreduced pressure. The resultant crude product was purified throughsilica gel column chromatography (developing solvent, petroleum ether)to give 12.0 g (yield 54%) of 2,2-bis(4-bromo-inden-1-yl)propane as ayellow solid.

¹H-NMR (400 MHz, CDCl₃); δ7.20 (d, 2H), 7.19 (d, 2H), 6.92 (t, 2H), 6.58(s, 2H), 3.39 (s, 4H), 1.72 (s, 6H).

(2) Synthesis of 3,5-di-t-butylphenylboronic acid

1-Bromo-3,5-di-t-butylbenzene and 40 mL of tetrahydrofuran were put in a100-mL glass reactor, and cooled to −70° C. in a dry ice-heptane bath.16.4 mL (40.9 mmol) of n-butyllithium-n-hexane solution (2.5 mol/L) wasdropwise added thereto, and stirred for 30 minutes. Subsequently at −78°C., 4.25 g (40.9 mmol) of trimethyl borate was added and stirred for 2hours, and further stirred at room temperature for 12 hours. An aqueous1 M hydrogen chloride solution was added to the reaction liquid untilthe pH of the liquid could reach 3, then transferred into a separatoryfunnel, extracted three times with t-butyl methyl ether, and dried withsodium sulfate. Sodium sulfate was filtered away, the solvent wasevaporated under reduced pressure, and the resultant crude product waspurified through silica gel column chromatography (developing solvent,petroleum ether/ethyl acetate=20/1) to give 8.00 g (yield 91%) of3,5-di-t-butylphenylboronic acid as a pale yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ7.72 (d, 1H), 7.57 (s, 2H), 4.61 (s, 2H), 1.32(s, 18H).

(3) Synthesis of dimethylbis(4-(3,5-di-t-butylphenyl)-inden-1-yl)methane

21.6 g (102 mmol) of tripotassium phosphate, 150 mL of distilled water,150 mL of DME, 14.3 g (61.3 mmol) of 3,5-di-t-butylphenylboronic acid,11.0 g (25.5 mmol) of 2,2-bis(4-bromoinden-1-yl)propane, 358 mg (0.510mmol) of dichlorobis(triphenylphosphine)palladium, and 267 mg (1.02mmol) of triphenyl phosphine were put into a 500-mL glass reactor inthat order, and then heated under reflux at 90° C. for 48 hours. Thiswas left cooled to room temperature, then the reaction liquid was pouredinto 50 mL of distilled water, transferred into a separatory funnel, andextracted three times with ethyl acetate, and dried with sodium sulfate.Sodium sulfate was filtered away, the solvent was evaporated away underreduced pressure, and the resultant crude product was purified throughsilica gel column chromatography (developing solvent, petroleum ether)to give 10.0 g (yield 60%) ofdimethylbis(4-(3,5-di-t-butylphenyl)-inden-1-yl)methane as a yellowsolid.

¹H-NMR (400 MHz, CDCl₃): δ7.43 (m, 4H), 7.38 (d, 4H), 7.22-7.12 (m, 4H),6.59 (s, 2H), 3.50 (d, 4H), 1.82 (s, 6H), 1.39 (s, 36H).

(4) Synthesis ofracemic-isopropylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]hafniumdichloride

3.25 g (5.00 mmol) ofdimethylbis(4-(3,5-di-t-butylphenyl)-inden-1-yl)methane and 50 ml ofdiethyl ether were put in a 200-mL glass reactor, and cooled to −70° C.in a dry ice-heptane bath. 6.2 mL (10.2 mmol) of n-butyllithium-n-hexanesolution (1.64 mol/L) was dropwise added thereto, and stirred at roomtemperature for 4 hours. The solvent was evaporated away from thereaction liquid under reduced pressure, 60 mL of toluene was addedthereto, and cooled to −70° C. in a dry ice-heptane bath. 1.60 g (5.00mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 16 hours.The ratio of the racemic form to the meso form formed in this stage was17/83.

The solvent was evaporated away under reduced pressure from the reactionliquid, 10 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was cooled to room temperature, then filtered throughglass frit, and the solid was washed twice with 3 mL of DME to give 3.35g of a racemic form ofisopropylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]hafnium dichloride,as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.79 (d, 2H), 7.50 (d, 4H), 7.41 (s, 2H),7.32 (d, 2H), 7.13 (dd, 2H), 6.80 (d, 2H), 6.19 (d, 2H), 2.42 (s, 6H),1.31 (s, 36H).

(5) Synthesis ofracemic-isopropylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafnium dichloride(the content is 1.16 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.7 mL (11.1 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 90° C. for 2.5 hours. The reactionliquid was cooled to 0° C. in an ice bath, then 1.15 mL (9.10 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for15 minutes, and subsequently 2.3 mL (26.9 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 40 minutes. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in5 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 3 mL of hexane to give 611 mg of a racemic formof isopropylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethylhafniumas a yellow solid. The yield based on the ligand was 48% (presumed thatall the dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.79 (d, 4H), 7.60 (s, 2H), 7.41 (d, 2H), 7.33(d, 2H), 6.94 (d, 2H), 6.90 (dd, 2H), 5.57 (d, 2H), 1.80 (s, 6H), 1.35(s, 36H), −0.86 (s, 6H).

Synthesis of metallocene compound I:isopropylidenebis[4-(3-t-butylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound I (1) Synthesis of 4-(3-t-butylphenyl)indene

40.4 g (205 mmol) of tripotassium phosphate, 200 mL of distilled water,200 mL of DME, 21.9 g (123 mmol) of 3-t-butylphenylboronic acid, 20.0 g(102 mmol) of 7-bromo-1H-indene, 720 mg (1.02 mmol) ofdichlorobis(triphenylphosphine)palladium, and 537 mg (2.05 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 15 hours. This was leftcooled to room temperature, transferred into a separatory funnel, andextracted three times with ethyl acetate. The ethyl acetate solution waswashed three times with saturated saline water, and dried with sodiumsulfate. Sodium sulfate was filtered away, the solvent was evaporatedaway under reduced pressure, and the residue was purified through silicagel column chromatography (developing solvent, petroleum ether) to give22.7 g (yield 89%) of 4-(3-t-butylphenyl)indene as a yellow oil.

(2) Synthesis of 2,2-bis(4-(3-t-butylphenyl)-inden-1-yl)propane

10.0 g (40.3 mmol) of 4-(3-t-butylphenyl)indene, 100 mL of DME and 3.00g (52.3 mmol) of potassium hydroxide were put in a 200-mL glass reactor,and heated under reflux at 90° C. for 1 hour. The reaction liquid wascooled to 0° C., 1.20 mL (20.0 mmol) of acetone was added, and thenheated under reflux at 90° C. for 12 hours. The reaction liquid wascooled to room temperature, 200 mL of distilled water was added,transferred into a separatory funnel, extracted three times with ethylacetate, and dried with sodium sulfate. Sodium sulfate was filteredaway, the solvent was evaporated away under reduced pressure, and theresidue was purified through silica gel column chromatography(developing solvent, petroleum ether/dichloromethane=20/1) to give 5.00g (yield 46%) of 2,2-bis(4-(3-t-butylphenyl)-inden-1-yl)propane as ayellow solid.

¹H-NMR (400 MHz, CDCl₃): δ7.55 (s, 2H), 7.42-7.37 (m, 6H), 7.36-7.31 (m,2H), 7.18 (d, 2H), 7.13 (t, 2H), 6.58 (t, 2H), 3.48 (d, 2H), 1.81 (s,6H), 1.38 (s, 18H).

(3) Synthesis of isopropylidenebis(4-(3-t-butylphenyl)-1-indenyl)hafniumdichloride

3.01 g (5.6 mmol) of 2,2-bis(4-(3-t-butylphenyl)-inden-1-yl)propane wasput in a 200-mL three-neck flask having a rotor set therein and equippedwith a three-way cock and a thermometer, and 50 mL of toluene and 30 mLof diethyl ether were added to dissolve the compound. This was cooled to−70° C. in a dry ice-isopropyl alcohol bath, and 7.2 mL (13.0 mmol) ofn-butyllithium/hexane (1.64 M solution) was added and stirred for 80minutes. The cooling bath was removed and the mixture was restored toroom temperature, and the solvent was evaporated away. 80 mL of tolueneand 4 mL of diethyl ether were added to dissolve the mixture, and cooledto −70° C. 1.90 g (5.9 mmol) of hafnium tetrachloride was added, andimmediately the cooling bath was removed and the mixture was graduallyrestored to room temperature. From ¹H-NMR thereof, the stereoisomericcomposition of the resultant complex was racemic form/meso form=33/67.The solvent was evaporated away, 30 ml of DME was added and heated withstirring at 60° C. for 5 hours. The supernatant was collected throughdecantation. The solid was dried under reduced pressure, 50 mL oftoluene was added, and the insoluble matter was removed throughfiltration. The filtrate was concentrated, and the resultant solid waswashed with a small amount of hexane and dried under reduced pressure togive isopropylidenebis(4-(3-t-butylphenyl)-1-indenyl)hafnium dichlorideas a pale yellow powdery solid. The racemic purity of the compound was100%, and the yield thereof was 2.24 g and 51%.

¹H-NMR (400 MHz, CDCl₃): δ7.79 (d, J=8.8 Hz, 2H), 7.72 (s, 2H),7.39-7.34 (m, 6H), 6.29 (d, J=6.4 Hz, 2H), 7.13-7.10 (m, 2H), 6.74 (dd,J=3.6 Hz, 6H), 6.19 (d, J=3.6 Hz, 2H), 2.41 (s, 6H), 1.29 (s, 18H).

(4) Synthesis ofisopropylidenebis(4-(3-t-butylphenyl)-1-indenyl)dimethylhafnium

0.51 g (0.64 mmol) ofisopropylidenebis(4-(3-t-butylphenyl)-1-indenyl)hafnium dichloride and30 ml of toluene were put in a 100-mL side-arm flask having a rotor settherein, and dissolved. 2.2 mL (6.6 mmol) of methylmagnesiumbromide/diethyl ether (3.0 M solution) was added, and then heated withstirring at 60° C. for 9 hours. At room temperature, 0.63 ml (5.0 mmol)of trimethylsilyl chloride was added, stirred for 20 minutes, and 5 mlof dioxane was added and stirred for 30 minutes. The insoluble matterwas removed through filtration, and the filtrate was concentrated togive a yellow solid. This was washed with a small amount of hexane, andthe supernatant was removed three times through decantation, and theresidue was dried under reduced pressure to give a pale yellow powderysolid ofisopropylidenebis(4-(3-t-butylphenyl)-1-indenyl)dimethylhafnium. Theracemic form purity of the compound was 100%, the yield thereof was 0.36g and 76%.

¹H-NMR (400 MHz, C₆D₆): δ7.88 (s, 2H), 7.57-7.54 (m, 2H), 7.35 (d, J=8.8Hz, 2H), 7.24-7.20 (m, 6H), 6.86-6.82 (m, 4H), 5.56 (d, J=3.6 Hz, 2H),1.77 (s, 6H), 1.23 (s, 18H), −0.91 (s, 6H).

Synthesis of metallocene compound J:isopropylidenebis[4-(2,5-dimethylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound J (1) Synthesis of 4-(2,5-dimethylphenyl)indene

38 g (180 mmol) of tripotassium phosphate, 100 mL of distilled water,100 mL of DME, 10 g (66.7 mmol) of 2,5-dimethylphenylboronic acid, 10.8g (55.4 mmol) of 7-bromo-1H-indene, 969 mg (1.38 mmol) ofdichlorobis(triphenylphosphine)palladium, and 1.30 g (4.96 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 16 hours. This was leftcooled to room temperature, and the reaction liquid was poured into 100mL of distilled water, transferred into a separatory funnel, andextracted three times with hexane. 6 mL of concentrated hydrochloricacid was added to the hexane solution at room temperature, then stirredat room temperature for 30 minutes, the palladium compound wasprecipitated, filtered away through filter paper, and the filtrate waswashed three times each with saturated saline water and distilled water,and then dried with sodium sulfate. Sodium sulfate was filtered away,the solvent was evaporated away under reduced pressure, and the residuewas purified through silica gel column chromatography (developingsolvent, hexane/diisopropyl ether=20/1) to give 12.2 g (yield 100%) of4-(2,5-dimethylphenyl)indene as a colorless liquid.

(2) Synthesis of 2,2-bis(4-(2,5-dimethylphenyl)-inden-1-yl)propane

12.2 g (55.4 mmol) of 4-(2,5-dimethylphenyl)indene, 85 mL of DME and4.26 g (75.9 mmol) of potassium hydroxide were put in a 200-mL glassreactor, and heated under reflux at 90° C. for 2 hours. The reactionliquid was cooled to 0° C., 2.05 mL (27.2 mmol) of acetone was added,and then heated under reflux at 90° C. for 6 hours. The reaction liquidwas cooled to room temperature, 100 mL of distilled water was added,cooled to 0° C. in an ice bath, 6 mL of concentrated hydrochloric acidwas added, and then stirred at room temperature for 15 minutes. Thereaction liquid was transferred into a separatory funnel, extractedthree times with diisopropyl ether, and the resultant diisopropyl ethersolution was washed three times each with saturated saline water anddistilled water, and then dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent concentrated, and the residue wasrecrystallized at −20° C. to give 6.47 g (yield 49%) of2,2-bis(4-(2,5-dimethylphenyl)-inden-1-yl)propane as a white solid.

¹H-NMR (400 MHz, 400 MHz, CDCl₃): δ7.34 (dd, 2H), 7.22-7.00 (m, 8H),6.91 (d, 2H), 6.51 (t, 2H), 3.15 (brs, 4H), 2.34 (s, 6H), 2.07 (s, 6H),1.79 (s, 6H).

(3) Synthesis ofisopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)hafnium dichloride

3.01 g (6.3 mmol) of 2,2-bis(4-(2,5-dimethylphenyl)-inden-1-yl)propanewas put in a 200-mL three-neck flask having a rotor set therein andequipped with a three-way cock and a thermometer, and 50 mL of tolueneand 30 mL of diethyl ether were added to dissolve the compound. This wascooled to −70° C. in a dry ice-isopropyl alcohol bath, and 8.0 mL (13.0mmol) of n-butyllithium/hexane (1.63 M solution) was added and stirredfor 60 minutes. The cooling bath was removed and the mixture wasrestored to room temperature, and the solvent was evaporated away underreduced pressure. 80 mL of toluene and 5 mL of diethyl ether were addedto dissolve the mixture, and cooled to −70° C. 2.11 g (6.6 mmol) ofhafnium tetrachloride was added, and immediately the cooling bath wasremoved and the mixture was gradually restored to room temperature. Thesolvent was evaporated away, and 50 mL of DME was added and heated withstirring at 60° C. for 6 hours. The supernatant was removed throughdecantation, the solid was dried under reduced pressure, 60 mL oftoluene was added, and the insoluble matter was removed throughfiltration. The filtrate was concentrated, and the resultant solid waswashed with a small amount of hexane, and dried under reduced pressureto give isopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)hafniumdichloride as a yellow powdery solid. The racemic purity of the compoundwas 100%, and the yield thereof was 1.60 g and 35%.

¹H-NMR (400 MHz, CDCl₃): δ7.74 (d, J=8.8 Hz, 2H), 7.31 (s, 2H),7.19-7.03 (m, 10H), 6.31 (s, 2H), 6.12 (s, 2H), 2.40 (s, 6H), 2.30 (s,6H), 62.05 (s, 6H).

(4) Synthesis ofisopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium

0.55 g (0.76 mmol) ofisopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)hafnium dichlorideand 30 ml of toluene were put in a 100-mL side-arm flask having a rotorset therein, and dissolved. 2.5 mL (7.5 mmol) of methylmagnesiumbromide/diethyl ether (3.0 M solution) was added, and then heated withstirring at 60° C. for 6 hours. At room temperature, 0.68 ml (5.4 mmol)of trimethylsilyl chloride was added, stirred for 20 minutes, and 5 mlof dioxane was added and stirred for 30 minutes. The precipitate wasremoved through filtration, and the resulting filtrate was concentratedto give a yellow solid. This was washed with a small amount of hexane,and the supernatant was removed through decantation, and the residue wasdried under reduced pressure to give a pale yellow powdery solid ofisopropylidenebis(4-(2,5-dimethylphenyl)-1-indenyl)dimethylhafnium. Theracemic form purity of the compound was 100%, the yield thereof was 0.42g and 80%.

¹H-NMR (400 MHz, C₆D₆): δ7.48 (s, 2H), 7.31 (d, J=8.8 Hz, 2H), 7.11 (d,J=7.8 Hz, 2H), 7.04 (d, J=6.6 Hz, 2H), 6.97 (d, J=7.8 Hz, 2H), 6.82-6.78(m, 2H), 6.41 (s, 2H), 5.60 (d, J=3.6 Hz, 2H), 2.16 (s, 6H), 2.09 (s,6H), 1.77 (s, 6H), −0.94 (s, 6H).

Synthesis of metallocene compound K:isopropylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)dimethylhafnium

Metallocene Compound K (1) Synthesis of 4-(2,3-dimethylphenyl)indene

38 g (180 mmol) of tripotassium phosphate, 100 mL of distilled water,100 mL of DME, 10 g (66.7 mmol) of 2,3-dimethylphenylboronic acid, 10.8g (55.4 mmol) of 7-bromo-1H-indene, 1.0 g (1.42 mmol) ofdichlorobis(triphenylphosphine)palladium, and 1.30 g (4.96 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 11 hours. This was leftcooled to room temperature, and the reaction liquid was poured into 100mL of distilled water, transferred into a separatory funnel, andextracted three times with hexane. 6 mL of concentrated hydrochloricacid was added to the hexane solution at room temperature, then stirredat room temperature for 30 minutes, the palladium compound wasprecipitated, filtered away through filter paper, and the filtrate waswashed three times each with saturated saline water and distilled water,and then dried with sodium sulfate. Sodium sulfate was filtered away,the solvent was evaporated away under reduced pressure, and the residuewas purified through silica gel column chromatography (developingsolvent, hexane/diisopropyl ether=20/1) to give 11.66 g (yield 96%) of4-(2,3-dimethylphenyl)indene as a colorless oil.

(2) Synthesis of 2,2-bis(4-(2,3-dimethylphenyl)-inden-1-yl)propane

11.66 g (52.9 mmol) of 4-(2,3-dimethylphenyl)indene, 85 mL of DME and4.00 g (71.3 mmol) of potassium hydroxide were put in a 200-mL glassreactor, and heated under reflux at 90° C. for 2 hours. The reactionliquid was cooled to 0° C., 1.95 mL (26.5 mmol) of acetone was added,and then heated under reflux at 90° C. for 7 hours. The reaction liquidwas cooled to room temperature, 100 mL of distilled water was added,cooled to 0° C. in an ice bath, 6 mL of concentrated hydrochloric acidwas added, and then stirred at room temperature for 15 minutes. 100 mLof diisopropyl ether was added to the reaction liquid, stirred, and theresultant suspension was filtered through filter paper, and the solid onthe filtrate was washed with hexane to give 7.24 g (yield 57%) of2,2-bis(4-(2,3-dimethylphenyl)-inden-1-yl)propane as a white solid.

¹H-NMR (400 MHz, CDCl₃); racemic form: δ7.35 (d, 2H), 7.22-7.04 (m, 8H),6.92 (d, 2H), 6.52 (t, 2H), 3.20 (d, 2H), 3.06 (d, 2H), 2.35 (s, 6H),2.02 (brs, 6H), 1.80 (s, 6H).

(3) Synthesis ofracemic-isopropylidenebis(4-(2,3-dimethylphenyl)-1-indenyl)hafniumdichloride

2.60 g (5.00 mmol) of 2,2-bis(4-(2,3-dimethylphenyl)-inden-1-yl)propaneand 50 mL of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 6.2 mL (10.2 mmol) ofn-butyllithium/n-hexane solution (1.64 mol/L) was dropwise addedthereto, and stirred at room temperature for 4 hours. The solvent wasevaporated away from the reaction liquid under reduced pressure, 80 mLof toluene was added, and cooled to −70° C. in a dry ice-heptane bath.1.60 g (5.00 mmol) of hafnium tetrachloride was added thereto.Subsequently, while gradually restored to room temperature, this wasstirred for 17 hours. The ratio of the racemic form to the meso formformed in this stage was 3/7.

The solvent was evaporated away from the reaction liquid under reducedpressure, and 35 mL of DME was added thereto and stirred at 60° C. for 5hours. The reaction liquid was cooled to room temperature, filteredthrough glass frit, and the solid was collected through filtration togive 2.25 g of a racemic form ofisopropylidenebis[4-(2,3-dimethylphenyl)-1-indenyl]hafnium dichloridecontaining lithium chloride, as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.74 (d, 2H) 7.31 (dd, 2H), 7.20-7.00 (m,8H), 6.25 (d, 2H), 6.12 (d, 2H), 2.40 (s, 6H), 2.31 (s, 6H), 1.95 (s,6H).

(4) Synthesis ofracemic-isopropylidenebis[4-(2,3-methylphenyl)-1-indenyl)dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(2,3-dimethylphenyl)-1-indenyl]hafnium dichloride(the content is 1.37 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.2 mL (9.6 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 80° C. for 4.5 hours. The reactionliquid was cooled to 0° C. in an ice bath, then 0.84 mL (6.8 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for10 minutes, and subsequently 1.70 mL (20.5 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 30 minutes. Thesuspension was filtered through Celite, the solvent was evaporated awayunder reduced pressure, and the resultant yellow solid was suspended in10 mL of hexane, filtered through glass frit, and the solid was furtherwashed twice with 3 mL of hexane to give 260 mg of a racemic form ofisopropylidenebis[4-(2,3-dimethylphenyl)-1-indenyl]dimethylhafnium as ayellow solid. The yield based on the ligand was 26% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.63 (d, 2H), 7.42 (d, 2H), 7.30-7.06 (m, 6H),6.91 (dd, 2H), 6.48 (d, 2H), 5.71 (d, 2H), 2.21 (s, 6H), 2.15 (s, 6H),1.88 (s, 6H), −0.87 (s, 6H).

Synthesis of metallocene compound L:isopropylidenebis[4-(3-methylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound L (1) Synthesis of 4-(3-methylphenyl)indene

38 g (180 mmol) of tripotassium phosphate, 100 mL of distilled water,100 mL of DME, 10 g (73.6 mmol) of 3-methylphenylboronic acid, 12.0 g(61.5 mmol) of 7-bromo-1H-indene, 323 mg (0.460 mmol) ofdichlorobis(triphenylphosphine)palladium, and 432 mg (1.65 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 8 hours. This was left cooledto room temperature, then the reaction liquid was poured into 100 mL ofdistilled water, transferred into a separatory funnel, and extractedthree times with hexane. At room temperature 6 mL of concentratedhydrochloric acid was added to the hexane solution, then stirred at roomtemperature for 30 minutes, the palladium compound was precipitated,filtered out through filter paper, and the filtrate was washed threetimes each with saturated saline water and distilled water, and driedwith sodium sulfate. Sodium sulfate was filtered away, the solvent wasevaporated away under reduced pressure, and the residue was purifiedthrough silica gel column chromatography (developing solvent,hexane/diisopropyl ether=20/1) to give 12.7 g (yield 100%) of4-(3-methylphenyl)indene as a colorless oil.

(2) Synthesis of 2,2-bis(4-(3-methylphenyl)-inden-1-yl)propane

12.7 g (61.6 mmol) of 4-(3-methylphenyl)indene, 85 mL of DME, and 4.66 g(83.1 mmol) of potassium hydroxide were put in a 200-mL glass reactor,and heated under reflux at 90° C. for 2 hours. The reaction liquid wascooled to 0° C., then 2.25 mL (30.6 mmol) of acetone was added theretoand heated under reflux at 90° C. for 7 hours. The reaction liquid wascooled to room temperature, then 100 mL of distilled water was addedthereto, cooled to 0° C. in an ice bath, 6 mL of concentratedhydrochloric acid was added thereto, and stirred at room temperature for15 minutes. 100 mL of diisopropyl ether was added to the reaction liquidand stirred, and then the resultant suspension was filtered throughfilter paper, and the solid on the filter paper was washed withdistilled water to give 9.65 g (yield 69%) of2,2-bis(4-(3-methylphenyl)-inden-1-yl)propane as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ7.44-7.30 (m, 8H), 7.22-7.06 (m, 6H), 6.58 (t,2H), 3.48 (d, 4H), 2.42 (s, 6H), 1.80 (s, 6H).

(3) Synthesis ofracemic-isopropylidenebis[4-(3-methylphenyl)-1-indenyl]hafniumdichloride

2.40 g (5.00 mmol) of 2,2-bis(4-(3-methylphenyl)-inden-1-yl)propane and50 ml of diethyl ether were put in a 200-mL glass reactor, and cooled to−70° C. in a dry ice-heptane bath. 6.2 mL (10.2 mmol) of n-butyllithium/n-hexane solution (1.64 mol/L) was dropwise added thereto, andstirred at room temperature for 4 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 60 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 1.60 g (5.00mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 16 hours.The ratio of the racemic form to the meso form formed in this stage was3/4.

The solvent was evaporated away under reduced pressure from the reactionliquid, 13 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was cooled to room temperature, then filtered throughglass frit, and the solid was washed twice with 3 ml of DME to give 2.79g of a racemic form ofisopropylidenebis[4-(3-methylphenyl)-1-indenyl]hafnium dichloridecontaining lithium chloride, as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.76 (d, 2H), 7.41 (s, 2H), 7.38 (d, 2H),7.31 (t, 2H), 7.26 (d, 2H), 7.16 (d, 2H), 7.10 (dd, 2H), 6.73 (d, 2H),6.17 (d, 2H), 2.40 (s, 6H), 2.37 (s, 6H).

(4) Synthesis ofracemic-isopropylidenebis[4-(3-methylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(3-methylphenyl)-1-indenyl]hafnium dichloride (thecontent is 1.43 mmol or less) and 50 mL of toluene were put in a 100-mLglass reactor. 3.3 mL (9.9 mmol) of methylmagnesium bromide/diethylether solution (3.0 mol/L) was dropwise added thereto at roomtemperature, and stirred at 80° C. for 2 hours. The reaction liquid wascooled to 0° C. in an ice bath, then 0.90 mL (7.1 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for30 minutes, and subsequently 1.80 mL (21.0 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 40 minutes. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in10 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 5 mL of hexane to give 678 mg of a racemic formof isopropylidenebis[4-(3-methylphenyl)-1-indenyl]dimethylhafnium as ayellow solid. The yield based on the ligand was 56% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.59 (d, 2H), 7.58 (s, 2H), 7.38 (d, 2H),7.26-7.12 (m, 4H), 6.98 (d, 2H), 6.87 (d, 2H), 6.85 (dd, 2H), 5.61 (d,2H), 2.14 (s, 6H), 1.80 (s, 6H), −0.92 (s, 6H).

Synthesis of metallocene compound M:isopropylidenebis[4-(2-methylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound M (1) Synthesis of 4-(2-methylphenyl)indene

38 g (180 mmol) of tripotassium phosphate, 100 mL of distilled water,100 mL of DME, 10 g (73.6 mmol) of 2-methylphenylboronic acid, 12.0 g(61.5 mmol) of 7-bromo-1H-indene, 1.00 g (1.42 mmol) ofdichlorobis(triphenylphosphine)palladium, and 1.30 g (4.96 mmol) oftriphenyl phosphine were put into a 500-mL glass reactor in that order,and then heated under reflux at 90° C. for 11 hours. This was leftcooled to room temperature, then the reaction liquid was poured into 100mL of distilled water, transferred into a separatory funnel, andextracted three times with hexane. At room temperature 6 mL ofconcentrated hydrochloric acid was added to the hexane solution, thenstirred at room temperature for 30 minutes, the palladium compound wasprecipitated, filtered out through filter paper, and the filtrate waswashed three times each with saturated saline water and distilled water,and dried with sodium sulfate. Sodium sulfate was filtered away, thesolvent was evaporated away under reduced pressure, and the residue waspurified through silica gel column chromatography (developing solvent,hexane/diisopropyl ether=20/1) to give 12.7 g (yield 100%) of4-(2-methylphenyl)indene as a colorless oil.

(2) Synthesis of 2,2-bis(4-(2-methylphenyl)-inden-1-yl)propane

13.0 g (63.0 mmol) of 4-(2-methylphenyl)indene, 90 mL of DME, and 4.77 g(85.0 mmol) of potassium hydroxide were put in a 200-mL glass reactor,and heated under reflux at 90° C. for 2 hours. The reaction liquid wascooled to 0° C., then 2.35 mL (32.0 mmol) of acetone was added theretoand heated under reflux at 90° C. for 7 hours. The reaction liquid wascooled to room temperature, then 100 mL of distilled water was addedthereto, cooled to 0° C. in an ice bath, 7.2 mL of concentratedhydrochloric acid was added thereto, and stirred at room temperature for15 minutes. The reaction liquid was filtered through filter paper, andthe solid on the filter paper was washed with distilled water and hexaneto give 9.58 g (yield 67%) of2,2-bis(4-(2-methylphenyl)-inden-1-yl)propane as a white solid.

¹H-NMR (400 MHz, CDCl₃): δ7.35 (d, 2H), 7.33-7.18 (m, 8H), 7.11 (t, 2H),6.93 (d, 2H), 6.25 (t, 2H), 3.15 (brs, 4H), 2.12 (s, 6H), 1.80 (s, 6H).

(3) Synthesis ofracemic-isopropylidenebis[4-(2-methylphenyl)-1-indenyl]hafniumdichloride

2.26 g (5.00 mmol) of 2,2-bis(4-(2-methylphenyl)-inden-1-yl)propane and50 ml of diethyl ether were put in a 200-mL glass reactor, and cooled to−70° C. in a dry ice-heptane bath. 6.2 mL (10.2 mmol) of n-butyllithium/n-hexane solution (1.64 mol/L) was dropwise added thereto, andstirred at room temperature for 4 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 60 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 1.60 g (5.00mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 16 hours.The ratio of the racemic form to the meso form formed in this stage was3/4.

The solvent was evaporated away under reduced pressure from the reactionliquid, 13 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was cooled to room temperature, then filtered throughglass frit, and the solid was washed twice with 3 ml of DME to give 2.57g of a racemic form ofisopropylidenebis[4-(2-methylphenyl)-1-indenyl]hafnium dichloridecontaining lithium chloride, as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.79 (d, 2H), 7.44 (brs, 2H), 7.24 (brs, 6H),7.31 (t, 2H), 7.10 (d, 2H), 7.06 (t, 2H), 6.26 (brs, 2H), 6.13 (brs,2H), 2.40 (s, 6H), 2.07 (s, 6H).

(4) Synthesis ofracemic-isopropylidenebis[4-(2-methylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingisopropylidenebis[4-(2-methylphenyl)-1-indenyl]hafnium dichloride (thecontent is 1.43 mmol or less) and 50 mL of toluene were put in a 100-mLglass reactor. 3.3 mL (9.9 mmol) of methylmagnesium bromide/diethylether solution (3.0 mol/L) was dropwise added thereto at roomtemperature, and stirred at 80° C. for 2 hours. The reaction liquid wascooled to 0° C. in an ice bath, then 0.90 mL (7.1 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for30 minutes, and subsequently 1.85 mL (21.6 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 40 minutes. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in5 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 3 mL of hexane to give 688 mg of a racemic formof isopropylidenebis[4-(2-methylphenyl)-1-indenyl]dimethylhafnium as ayellow solid. The yield based on the ligand was 54% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.62 (brs, 2H), 7.30 (d, 2H), 7.20-7.10 (m,6H), 7.00 (d, 2H), 6.78 (dd, 2H), 6.35 (brs, 2H), 5.57 (brs, 2H), 2.16(s, 6H), 1.76 (s, 6H), −0.99 (s, 6H).

Synthesis of metallocene compound N:cyclobutlidenebis[4-(4-isopropropylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound N (1) Synthesis of1,1-bis[4-(4-isopropylphenyl)-inden-1-yl]cyclobutane

12.7 g (54.2 mmol) of 4-(4-isopropylphenyl)indene, 85 mL of DME, and4.11 g (75.9 mmol) of potassium hydroxide were put in a 200-mL glassreactor, and heated under reflux at 90° C. for 2 hours. The reactionliquid was cooled to 0° C., then 2.05 mL (27.2 mmol) of cyclobutanonewas added thereto and heated under reflux at 90° C. for 6 hours. Thereaction liquid was cooled to room temperature, then 100 mL of distilledwater was added thereto, cooled to 0° C. in an ice bath, 6 mL ofconcentrated hydrochloric acid was added thereto, and stirred at roomtemperature for 15 minutes. The reaction liquid was transferred into aseparatory funnel, extracted three times with diisopropyl ether, and theresultant diisopropyl ether solution was washed three times each withsaturated saline water and distilled water, and dried with sodiumsulfate. Sodium sulfate was filtered away, the solvent was evaporatedaway under reduced pressure, and the resultant crude product waspurified through silica gel column chromatography (developing solvent:diisopropyl ether/hexane=1/20) to give 11.0 g (yield 78%) of1,1-bis[4-(4-isopropylphenyl)-inden-1-yl]cyclobutane as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ7.44 (d, 4H), 7.39 (d, 2H), 7.29 (d, 4H), 7.22(t, 2H), 7.13 (d, 2H), 6.69 (s, 2H), 3.50 (s, 4H), 2.97 (sept, 2H), 2.78(t, 4H), 2.11 (quint, 2H), 1.31 (d, 12H).

(2) Synthesis ofracemic-cyclobutylidenebis[4-(4-isopropylphenyl)-indenyl]hafniumdichloride

3.12 g (6.00 mmol) of1,1-bis[4-(4-isopropylphenyl)-inden-1-yl]cyclobutane and 60 ml ofdiethyl ether were put in a 200-mL glass reactor, and cooled to −70° C.in a dry ice-heptane bath. 7.5 mL (12.3 mmol) of n-butyllithium/n-hexane solution (1.64 mol/L) was dropwise added thereto, andstirred at room temperature for 4 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 70 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 1.92 g (6.00mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 17 hours.The ratio of the racemic form to the meso form formed in this stage was1/2.

The solvent was evaporated away under reduced pressure from the reactionliquid, 20 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was, as such, filtered through glass frit, and the solidwas collected through filtration to give 1.62 g of a racemic form ofcyclobutylidenebis[4-(4-isopropylphenyl)-indenyl]hafnium dichloridecontaining lithium chloride, as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.43 (d, 2H), 7.40 (dd, 2H), 7.29 (d, 4H),7.22 (t, 2H), 7.13 (dd, 2H), 6.69 (t, 2H), 3.50 (d, 2H), 2.97 (sept,2H), 2.78 (t, 4H), 2.11 (quint, 2H), 1.31 (d, 12H).

(3) Synthesis ofracemic-cyclobutylidenebis[4-(4-isopropylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containing1,1-cyclobutylidenebis[4-(4-isopropylphenyl)-indenyl]hafnium dichloride(the content is 1.30 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.0 mL (9.0 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 80° C. for 3 hours. The reaction liquidwas cooled to 0° C. in an ice bath, then 0.82 mL (6.5 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for30 minutes, and subsequently 1.70 mL (19.9 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 1 hour. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in5 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 5 mL of hexane to give 612 mg of a racemic formof1,1-cyclobutylidenebis[4-(4-isopropylphenyl)-1-indenyl]dimethylhafniumas a yellow solid. The yield based on the ligand was 23% (presumed thatall the dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.74 (d, 4H), 7.22 (d, 2H), 7.17 (d, 4H), 7.13(d, 2H), 6.87 (d, 2H), 6.83 (dd, 2H), 5.53 (d, 2H), 3.06 (quartet, 2H),2.72 (sep, 2H), 2.60 (quartet, 2H), 2.07 (quintet, 2H), 1.12 (d, 12H),−0.93 (s, 6H).

Synthesis of metallocene compound O:cyclobutlidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafnium

Metallocene Compound O (1) Synthesis of1,1-bis[4-(3,5-dimethylphenyl)-inden-1-yl]cyclobutane

8.69 g (39.0 mmol) of 4-(3,5-dimethylphenyl)indene, 80 mL of DME, and2.84 g (50.7 mmol) of potassium hydroxide were put in a 200-mL glassreactor, and heated under reflux at 90° C. for 1 hour. The reactionliquid was cooled to 0° C., then a solution of cyclobutanone (1.33 g,19.1 mmol)/DME (40 mL) was added thereto and heated under reflux at 90°C. for 16 hours. The reaction liquid was cooled to room temperature,then 200 mL of distilled water was added thereto, transferred into aseparatory funnel, extracted three times with ethyl acetate, and theresultant ethyl acetate solution was washed three times each withsaturated saline water and distilled water, and dried with sodiumsulfate. Sodium sulfate was filtered away, the solvent was evaporatedaway under reduced pressure, and the resultant crude product waspurified through silica gel column chromatography (developing solvent:petroleum ether) to give 4.50 g (yield 49%) of1,1-bis[4-(3,5-dimethylphenyl)-inden-1-yl]cyclobutane as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ7.39 (d, 2H), 7.22 (t, 2H), 7.11 (s, 4H), 7.11(d, 2H), 7.00 (s, 2H), 6.68 (s, 2H), 3.48 (d, 4H), 2.77 (t, 4H), 2.37(s, 12H), 2.11 (quint, 2H).

(2) Synthesis ofracemic-cyclobutylidenebis[4-(3,5-dimethylphenyl)-indenyl]hafniumdichloride

2.46 g (5.00 mmol) of1,1-bis[4-(3,5-dimethylphenyl)-inden-1-yl]cyclobutane and 50 ml ofdiethyl ether were put in a 200-mL glass reactor, and cooled to −70° C.in a dry ice-heptane bath. 6.2 mL (10.2 mmol) of n-butyllithium/n-hexane solution (1.64 mol/L) was dropwise added thereto, andstirred at room temperature for 4 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 60 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 1.60 g (5.00mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 16 hours.The ratio of the racemic form to the meso form formed in this stage was42/58.

The solvent was evaporated away under reduced pressure from the reactionliquid, 10 mL of DME was added, and stirred at 60° C. for 5 hours. Thereaction liquid was, as such, filtered through glass frit, and the solidwashed twice with 3 mL of DME to give 2.41 g of a racemic form ofcyclobutylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafnium dichloridecontaining lithium chloride, as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.48 (d, 2H), 7.25 (d, 2H), 7.20 (s, 4H),7.06 (dd, 2H), 6.98 (s, 2H), 6.68 (d, 2H), 6.06 (d, 2H), 3.58 (quartet,2H), 3.15 (quartet, 2H), 2.49 (quintet, 2H), 2.32 (s, 12H).

(3) Synthesis ofracemic-cyclobutylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafnium

1.00 g of the above-mentioned, lithium chloride-containingcyclobutylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]hafnium dichloride(the content is 1.35 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.2 mL (9.4 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 80° C. for 3 hours. The reaction liquidwas cooled to 0° C. in an ice bath, then 0.85 mL (6.7 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for30 minutes, and subsequently 1.75 mL (20.5 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 40 minutes. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in5 mL of hexane, filtered through glass frit, and the solid was furtherwashed three times with 5 mL of hexane to give 622 mg of a racemic formof cyclobutylidenebis[4-(3,5-dimethylphenyl)-1-indenyl]dimethylhafniumas a yellow solid. The yield based on the ligand was 43% (presumed thatall the dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.45 (s, 4H), 7.23 (d, 2H), 7.14 (d, 2H), 6.89(d, 2H), 6.84 (dd, 2H), 6.81 (s, 1H), 5.57 (d, 2H), 3.07 (quartet, 2H),2.62 (quartet, 2H), 2.15 (s, 12H), 2.09 (quintet, 2H), −0.91 (s, 6H).

Synthesis of metallocene compound P (Comparative Example):dimethylsilylenebis(2-methyl-4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound P (1) Synthesis ofracemic-dimethylsilylenebis(2-methyl-4-phenyl-1-indenyl)hafniumdichloride

This was synthesized according to the method described in JP-A2001-253913.

(2) Synthesis ofracemic-dimethylsilylenebis(2-methyl-4-phenyl-1-indenyl)dimethylhafnium

1.48 g (2.07 mmol) ofdimethylsilylenebis(2-methyl-4-phenyl-1-indenyl)hafnium dichloride and60 mL of toluene were put in a 100-mL glass reactor. 14.0 mL (13.9 mmol)of methylmagnesium bromide/tetrahydrofuran solution (0.99 mol/L) wasdropwise added thereto at room temperature, and stirred at 80° C. for3.5 hours. The reaction liquid was cooled to 0° C. in an ice bath, then1.0 mL (7.9 mmol) of chlorotrimethylsilane was added thereto, stirred atroom temperature for 30 minutes, and subsequently 2.7 mL (32 mmol) of1,4-dioxane was added, and further stirred at room temperature for 30minutes. The suspension was filtered through Celite, and the filtratewas concentrated under reduced pressure, then statically left at −20° C.for recrystallization to give 322 mg (yield 23%) of a racemic form ofdimethylsilylenebis(2-methyl-4-phenyl-1-indenyl)dimethylhafnium as ayellow crystal.

¹H-NMR (400 MHz, C₆D₆): δ=7.75 (dd, 4H), 7.49 (d, 2H), 7.27 (d, 2H) 7.23(t, 4H), 7.12 (t, 2H), 7.03 (s, 2H), 6.85 (dd, 2H), 2.00 (s, 6H), 0.80(s, 6H), −0.83 (s, 6H).

Synthesis of metallocene compound Q (Comparative Example):dimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)dimethylhafnium

Metallocene Compound Q (1) Synthesis ofdimethylbis(2-isopropyl-4-phenylinden-1-yl)silane

2.00 g (8.52 mmol) of 2-isopropyl-4-phenylindene and 30 ml of THF wereput in a 200-mL glass reactor, and cooled to −78° C. in a dryice-methanol bath. 4.10 mL (10.2 mmol) of n-butyllithium/hexane solution(2.5 mol/L) was dropwise added thereto, and stirred at room temperaturefor 4 hours. This was cooled to −78° C., and 0.34 mg (0.42 mmol) of1-methylimidazole and 0.50 mL (4.26 mmol) of dimethyldichlorosilane wereadded thereto in that order, and stirred at room temperature for 1 hour.The solvent was evaporated away under reduced pressure, 30 mL of hexanewas added, the suspension was filtered, and the solvent was evaporatedaway from the filtrate under reduced pressure. The resultant crudeproduct was purified through silica gel column chromatography(developing solvent, petroleum ether) to give 1.00 g (yield 45%) ofdimethylbis(2-isopropyl-4-phenylinden-1-yl)silane as a pale yellowsolid.

(2) Synthesis ofracemic-dimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)hafniumdichloride

3.34 g (6.36 mmol) of dimethylbis(2-isopropyl-4-phenylinden-1-yl)silaneand 50 ml of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 8.0 mL (12.8 mmol) ofn-butyl lithium/n-hexane solution (1.62 mol/L) was dropwise addedthereto, and stirred for 2.5 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 65 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 2.04 g (6.37mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 17 hours.

The reaction solution was filtered through Celite, and the filtrate wasrepeatedly crystallized for recrystallization to give 1.20 g ofdimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)hafnium dichloride,as a mixture of racemic form/meso form=77/23.

60 mg of anhydrous lithium chloride and 6 mL of DME were added to themixture, and stirred at 60° C. for 5 hours. The reaction liquid wascooled to room temperature, then filtered through glass frit, and thesolid was washed twice with 5 mL of DME to give 464 mg (yield 10%) of aracemic form ofdimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)hafnium dichloride asan orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.74-7.70 (m, 6H), 7.44 (t, 4H), 7.40-7.28(m, 4H), 7.07 (dd, 2H), 6.89 (s, 2H), 3.31 (sep, 2H), 1.36 (s, 6H), 1.14(d, 6H), 1.11 (d, 6H).

(3) Synthesis ofracemic-dimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)dimethylhafnium

444 mg (0.575 mmol) ofdimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)hafnium dichlorideand 20 mL of toluene were put in a 100-mL glass reactor. 4.3 mL (4.6mmol) of methyllithium-diethyl ether solution (1.06 mol/L) was dropwiseadded thereto at room temperature, and stirred at 80° C. for 5 hours.The reaction liquid was filtered through Celite, and the filtrate wasconcentrated under reduced pressure, and statically left at −20° C. forrecrystallization to give 203 mg (yield 48%) of a racemic form ofdimethylsilylenebis(2-isopropyl-4-phenyl-1-indenyl)dimethylhafnium as ayellow crystal.

¹H-NMR (400 MHz, C₆D₆): δ=7.80 (dd, 4H), 7.50 (d, 2H), 7.36-7.16 (m, 8H)7.11 (t, 2H), 6.85 (t, 2H), 3.06 (sep, 2H), 1.15 (d, 6H), 0.95 (d, 6H),−0.83 (s, 6H).

Synthesis of metallocene compound R (Comparative Example):dimethylsilylenebis(2,4-dimethyl-1-indenyl)dimethylhafnium

Metallocene Compound R (1) Synthesis ofdimethylbis(2,4-dimethyl-inden-1-yl)silane

This was synthesized according to the method described in JapanesePatent 3389265.

(2) Synthesis ofracemic-dimethylsilylenebis(2,4-dimethyl-1-indenyl)hafnium dichloride

5.50 g (16.0 mmol) of dimethylbis(2-methyl-4-methyl-inden-1-yl)silaneand 60 ml of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 14.0 mL (35.2 mmol) ofn-butyllithium/n-hexane solution (2.5 mol/L) was dropwise added thereto,and stirred at room temperature for 2 hours and at 50° C. for 2 hours.The solvent was evaporated away under reduced pressure from the reactionliquid, 60 mL of diethyl ether was added, and cooled to −70° C. in a dryice/heptane bath. 5.60 g (17.6 mmol) of hafnium tetrachloride was addedthereto. Subsequently, while gradually restored to room temperature,this was stirred for 4 hours.

150 mL of dichloromethane was added, filtered through Celite, and thefiltrate was concentrated for recrystallization to give 0.30 g of aracemic form of dimethylsilylenebis(2,4-dimethyl-indenyl)hafniumdichloride as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.56 (d, 2H), 7.10 (d, 2H), 6.93 (dd, 2H),6.70 (s, 2H), 2.37 (s, 6H), 2.33 (s, 6H), 1.31 (s, 6H).

(3) Synthesis ofracemic-dimethylsilylenebis(2,4-dimethyl-1-indenyl)dimethylhafnium

0.592 g (1.00 mmol) of dimethylsilylenebis(2,4-dimethyl-indenyl)hafniumdichloride and 30 mL of toluene were put in a 100-mL glass reactor. 6.8mL (6.7 mmol) of methylmagnesium bromide-tetrahydrofuran solution (0.99mol/L) was dropwise added thereto at room temperature, and stirred at80° C. for 7.5 hours. The reaction liquid was cooled to 0° C. in an icebath, then 0.60 mL (4.7 mmol) of chlorotrimethylsilane was addedthereto, stirred at room temperature for 30 minutes, and subsequently,1.3 mL (15 mmol) of 1,4-dioxane was added, and further stirred at roomtemperature for 30 minutes. The suspension was filtered through Celite,the solvent was evaporated away under reduced pressure, the resultantyellow solid was suspended in 10 mL of hexane, filtered through glassfrit, and the solid was further washed twice with 3 mL of hexane to give310 mg (yield 56%) of a racemic form ofdimethylsilylenebis(2,4-dimethyl-indenyl)dimethylhafnium as a whitesolid.

¹H-NMR (400 MHz, C₆D₆): δ=7.39 (d, 2H), 6.96 (d, 2H), 6.79 (dd, 2H),6.57 (s, 2H), 2.28 (s, 6H), 2.03 (s, 6H), 0.80 (s, 6H), −1.08 (s, 6H).

Synthesis of metallocene compound S (Comparative Example):dimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)dimethylhafnium

Metallocene Compound S (1) Synthesis ofdimethylbis(2-methyl-4-isopropylinden-1-yl)silane

This was synthesized according to the method described in JapanesePatent 3482412.

(2) Synthesis ofracemic-dimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)hafniumdichloride

3.15 g (7.86 mmol) of dimethylbis(2-methyl-4-isopropylinden-1-yl)silaneand 45 ml of diethyl ether were put in a 200-mL glass reactor, andcooled to −70° C. in a dry ice-heptane bath. 6.6 mL (16.5 mmol) ofn-butyllithium/n-hexane solution (2.5 mol/L) was dropwise added thereto,and stirred at room temperature for 2 hours and at 50° C. for 2 hours.The solvent was evaporated away under reduced pressure from the reactionliquid, 45 mL of diethyl ether was added, and cooled to −70° C. in a dryice/heptane bath. 2.64 g (8.26 mmol) of hafnium tetrachloride was addedthereto. Subsequently, while gradually restored to room temperature,this was stirred for 16 hours.

The reaction liquid was filtered, the resultant solid was extracted with20 mL of dichloromethane, again filtered, and the solvent was evaporatedaway from the filtrate under reduced pressure to give 0.50 g of aracemic form ofdimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)hafnium dichloride asa yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.54 (d, 2H), 7.16 (d, 2H), 6.98 (dd, 2H),6.76 (s, 2H), 3.06 (sep, 2H), 2.34 (s, 6H), 1.34 (d, 6H), 1.28 (s, 6H),1.25 (d, 6H).

(3) Synthesis ofracemic-dimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)dimethylhafnium

0.573 g (0.884 mmol) ofdimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)hafnium dichlorideand 27 mL of toluene were put in a 100-mL glass reactor. 6.2 mL (6.1mmol) of methylmagnesium bromide-tetrahydrofuran solution (0.99 mol/L)was dropwise added thereto at room temperature, and stirred at 80° C.for 5 hours. The reaction liquid was cooled to 0° C. in an ice bath,then 0.45 mL (3.6 mmol) of chlorotrimethylsilane was added thereto,stirred at room temperature for 30 minutes, and subsequently, 0.90 mL(11 mmol) of 1,4-dioxane was added, and further stirred at roomtemperature for 30 minutes. The suspension was filtered through Celite,the solvent was evaporated away under reduced pressure, the resultantyellow solid was suspended in 10 mL of hexane, filtered through glassfrit, and the solid was further washed twice with 3 mL of hexane to give382 mg (yield 71%) of a racemic form ofdimethylsilylenebis(2-methyl-4-isopropyl-1-indenyl)dimethylhafnium as awhite solid.

¹H-NMR (400 MHz, C₆D₆): δ=7.41 (d, 2H), 7.10 (d, 2H), 6.82 (t, 2H), 6.73(s, 2H), 3.11 (sep, 2H), 2.07 (s, 6H), 1.36 (d, 2H), 1.27 (d, 6H), 0.83(s, 6H), −1.06 (s, 6H).

Synthesis of metallocene compound T (Comparative Example):cyclobutylidenebis(1-indenyl)dimethylhafnium

Metallocene Compound T (1) Synthesis of 1,1-bis(1-indenyl)cyclobutane

25.0 g (215 mmol) of indene, 250 mL of DME and 27.0 g (480 mmol) ofpotassium hydroxide were put in a 200-mL glass reactor, and heated underreflux at 90° C. for 1 hour. The reaction liquid was cooled to 0° C.,and 8.40 g (120 mmol) of cyclobutanone was added, and then heated underreflux at 90° C. for 6 hours. The reaction liquid was cooled to roomtemperature, 200 mL of distilled water was added, then transferred intoa separatory funnel, extracted twice with ethyl acetate, and theresultant ethyl acetate solution was washed with saturated saline waterand then with distilled water, and dried with sodium sulfate. Sodiumsulfate was filtered away, the solvent was evaporated away under reducedpressure, and the resultant crude product was purified through silicagel column chromatography (developing solvent, petroleum ether) to give12.0 g (yield 39%) of 1,1-bis(1-indenyl)cyclobutane as a white solid.

¹H-NMR (400 MHz, CDCl₃); δ7.39 (t, 4H), 7.11 (quint, 4H), 6.62 (s, 2H),3.40 (s, 4H), 2.73 (t, 4H), 2.09 (quint, 2H).

(2) Synthesis of racemic-cyclobutylidenebis(1-indenyl)hafnium dichloride

2.84 g (10.0 mmol) of 1,1-bis(1-indenyl)cyclobutane and 100 ml ofdiethyl ether were put in a 200-mL glass reactor, and cooled to −70° C.in a dry ice-heptane bath. 12.4 mL (20.5 mmol) of n-butyllithium/n-hexane solution (1.64 mol/L) was dropwise added thereto, andstirred at room temperature for 4 hours. The solvent was evaporated awayunder reduced pressure from the reaction liquid, 115 mL of toluene wasadded, and cooled to −70° C. in a dry ice/heptane bath. 3.20 g (10.0mmol) of hafnium tetrachloride was added thereto. Subsequently, whilegradually restored to room temperature, this was stirred for 17 hours.

The solvent was evaporated away from the reaction liquid under reducedpressure, 26 mL of DME was added thereto, and stirred at 60° C. for 5hours. The reaction liquid was cooled to room temperature, filteredthrough glass frit, and the resultant solid was extracted with 130 mL ofdichloromethane, and filtered through Celite. The filtrate was driedunder reduced pressure to give 3.76 g (yield 71%) of a racemic form ofcyclobutylidenebis(1-indenyl)hafnium dichloride as a yellow solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.51 (d, 2H), 7.48 (d, 2H), 7.27 (dd, 2H),6.98 (dd, 2H), 6.53 (d, 2H), 5.97 (d, 2H), 3.54 (quart, 2H), 3.12(quart, 2H), 2.46 (quint, 2H).

(3) Synthesis of cyclobutylidenebis(1-indenyl)dimethylhafnium

1.50 g (2.82 mmol) of cyclobutylidenebis(1-indenyl)hafnium dichlorideand 70 mL of toluene were put in a 200-mL glass reactor. 6.6 mL (19.8mmol) of methylmagnesium bromide-diethyl ether solution (3.0 mol/L) wasdropwise added thereto at room temperature, and stirred at 80° C. for 7hours. The reaction liquid was cooled to 0° C. in an ice bath, then 1.75mL (13.9 mmol) of chlorotrimethylsilane was added, stirred at roomtemperature for 30 minutes, and subsequently 3.50 mL (40.9 mmol) of1,4-dioxane was added, and further stirred at room temperature for 1hour. The suspension was filtered through Celite, and the solvent wasevaporated away under reduced pressure. The resultant yellow solid wassuspended in 10 mL of hexane, filtered through glass frit, and the solidwas further washed twice with 5 mL of hexane to give 810 mg (yield 59%)of a racemic form of cyclobutylidenebis(indenyl)dimethylhafnium as ayellow solid.

¹H-NMR (400 MHz, C₆D₆): δ=7.37 (d, 2H), 7.11 (dd, 2H), 7.05 (dd, 2H),7.23 (dd, 2H), 6.33 (d, 2H), 5.42 (d, 2H), 2.98 (quart, 2H), 2.54(quart, 2H), 2.02 (quint, 2H), −1.16 (s, 6H).

Synthesis of metallocene compound U:cyclobutylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethiumhafnium

Metallocene Compound U (1) Synthesis of 4-(3,5-di-t-butylphenyl)indene

This was synthesized according to the method described in JP-A2008-101034.

(2) Synthesis of 1,1-bis[4-(3,5-di-t-butylphenyl)-inden-1-yl]cyclobutane

15.7 g (51.6 mmol) of 4-(3,5-di-t-butylphenyl)indene, 85 mL of DME and3.18 g (56.7 mmol) of potassium hydroxide were put in a 500-mL glassreactor, and heated under reflux at 90° C. for 2 hours. The reactionliquid was cooled to 0° C., and 1.95 mL (21.9 mmol) of cyclobutanone wasadded, and then heated under reflux at 90° C. for 6 hours. The reactionliquid was cooled to room temperature, 6 mL of concentrated hydrochloricacid and 200 mL of distilled water were added, then transferred into aseparatory funnel, extracted three times with diisopropyl ether, and theresultant diisopropyl ether solution was washed three times withdistilled water, and dried with sodium sulfate. Sodium sulfate wasfiltered away, the solvent was evaporated away under reduced pressure,and the resultant crude product was purified through silica gel columnchromatography (developing solvent, hexane) to give 13.6 g (yield 80%)of 1,1-bis[4-(3,5-di-t-butylphenyl)-inden-1-yl]cyclobutane as an orangesolid.

¹H-NMR (400 MHz, CDCl₃): δ7.41 (d, 2H), 7.40 (s, 2H), 7.34 (s, 4H), 7.24(t, 2H), 7.16 (d, 2H), 6.68 (s, 2H), 3.48 (s, 4H), 2.78 (t, 4H), 2.09(quint, 2H), 1.35 (s, 36H).

(3) Synthesis ofracemic-cyclobutylidenebis[4-(3,5-di-t-butylphenyl)-indenyl]hafniumdichloride

3.31 g (5.00 mmol) of1,1-bis[4-(3,5-di-t-butylphenyl)-inden-1-yl]cyclobutane and 50 ml ofdiethyl ether were put in a 200-mL glass reactor, and cooled to 0° C. inan ice bath. 6.5 mL (10.3 mmol) of n-butyl lithium/n-hexane solution(1.58 mol/L) was dropwise added thereto, and stirred at room temperaturefor 4 hours. The solvent was evaporated away under reduced pressure fromthe reaction liquid, 60 mL of toluene was added, and cooled to −70° C.in a dry ice/heptane bath. 1.60 g (5.00 mmol) of hafnium tetrachloridewas added thereto. Subsequently, while gradually restored to roomtemperature, this was stirred for 17 hours. The ratio of the racemicform to the meso form formed in this stage was 18/82.

The solvent was evaporated away from the reaction liquid under reducedpressure, 5 mL of DME and 7 mL of n-hexane were added thereto, andstirred at 45° C. for 4 hours. The reaction liquid was cooled to roomtemperature, and filtered through glass frit to give 887 mg of a racemicform of cyclobutylidenebis[4-(3,5-di-t-butylphenyl)-indenyl]hafniumdichloride containing lithium chloride, as an orange solid.

¹H-NMR (400 MHz, CDCl₃): δ=7.52 (d, 2H), 7.48 (s, 4H), 7.40 (s, 2H),7.31 (d, 2H), 7.10 (dd, 2H), 6.72 (d, 2H), 6.08 (d, 2H), 3.60 (quartet,2H), 3.18 (quartet, 2H), 2.48 (quintet, 2H), 1.30 (s, 36H).

(4) Synthesis ofracemic-cyclobutylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethylhafnium

855 mg of the above-mentioned, lithium chloride-containingcyclobutylidenebis[4-(3,5-di-t-butylphenyl)-indenyl]hafnium dichloride(the content is 0.941 mmol or less) and 50 mL of toluene were put in a100-mL glass reactor. 3.15 mL (9.45 mmol) of methylmagnesiumbromide/diethyl ether solution (3.0 mol/L) was dropwise added thereto atroom temperature, and stirred at 90° C. for 5 hours. The reaction liquidwas cooled to 0° C. in an ice bath, then 0.95 mL (7.5 mmol) ofchlorotrimethylsilane was added thereto, stirred at room temperature for30 minutes, and subsequently 1.95 mL (22.8 mmol) of 1,4-dioxane wasadded, and further stirred at room temperature for 30 minutes. Thesuspension was filtered through Celite, and the solvent was evaporatedaway under reduced pressure. The resultant yellow solid was suspended in5 mL of hexane and filtered through glass frit to give 615 mg of aracemic form ofcyclobutylidenebis[4-(3,5-di-t-butylphenyl)-1-indenyl]dimethylhafnium asa yellow solid. The yield based on the ligand was 15% (presumed that allthe dichloro form was used).

¹H-NMR (400 MHz, C₆D₆): δ=7.80 (d, 4H), 7.59 (t, 2H), 7.33 (d, 2H), 7.16(d, 2H), 6.92 (d, 2H), 6.87 (dd, 2H), 5.53 (d, 2H), 3.08 (quartet, 2H),2.60 (quartet, 2H), 2.07 (quintet, 2H), 1.35 (s, 36H), −0.87 (s, 6H).

<2> Batch Solution Polymerization: Ethylene/1-Hexene CopolymerizationExample 1

1000 mL of toluene and 58 mL of 1-hexene were put in a 2.3-L stainlessautoclave (equipped with a stirrer and a temperature control unit) thathad been fully dried and purged with nitrogen, and heated at 150° C.After the temperature inside the reactor became stable, the reactor waspressurized up to 0.7 MPaG with nitrogen, and further up to 2.7 MPaGwith ethylene. Subsequently, 0.1 mmol of tri(n-octyl)aluminium wasintroduced as pressurized with nitrogen. A solution of metallocenecompound A 0.24 μmol-toluene 1 mL, and a solution of cocatalyst[Me₂N(H)C₆H₅][B(C₆F₅)₄] 0.12 μmol-toluene 1 mL were brought into contactwith each other in nitrogen at room temperature, and then stirred atroom temperature for 10 minutes, and the resultant solution wasintroduced into the reactor, as pressurized with nitrogen, and thepolymerization was started. Subsequently, while the inner pressure wascontrolled to be at 2.7 MPa, this was kept stirred for 13 minutes, andthen ethanol was introduced as pressurized with nitrogen to stop thereaction. After cooled, this was dried to give a polymer. The polymeryield was 10.0 g.

The polymer indices were: density=0.8804 g/cm³, MFR=1.22 g/10 min,weight-average molecular weight Mw=98,900, number-average molecularweight Mn=51,500, Mw/Mn=1.92, T_(m)=61.2° C., 1-hexene content 11.1 mol%.

Example 2

The same polymerization operation as in Example 1 was carried out,except that 0.07 μmol of the metallocene compound A was used, 0.14 μmolof the cocatalyst was used, and the polymerization time was 14 minutes.The polymer yield was 6.7 g.

The polymer indices were: density=0.8800 g/cm³, MFR=0.79 g/10 min,Mw=108,100, Mn=51,700, Mw/Mn=2.09, T_(m)=59.6° C.

Example 3

The same polymerization operation as in Example 1 was carried out,except that 0.28 μmol of the metallocene compound B was used in place ofthe metallocene compound A, 0.14 μmol of the cocatalyst was used, andthe polymerization time was 12 minutes. The polymer yield was 7.3 g.

The polymer indices were: density=0.8793 g/cm³, MFR=0.87 g/10 min,Mw=104,100, Mn=52,100, Mw/Mn=2.00, T_(m)=60.0° C.

Example 4

The same polymerization operation as in Example 1 was carried out,except that 0.30 μmol of the metallocene compound C was used in place ofthe metallocene compound A, 0.15 μmol of the cocatalyst was used, andthe polymerization time was 12 minutes. The polymer yield was 4.3 g.

The polymer indices were: density=0.8770 g/cm³, MFR=0.18 g/10 min,Mw=171,300, Mn=84,800, Mw/Mn=2.02, T_(m)=59.4° C., 1-hexene content 11.4mol %.

Example 5

The same polymerization operation as in Example 1 was carried out,except that 0.28 μmol of the metallocene compound D was used in place ofthe metallocene compound A, 0.14 μmol of the cocatalyst was used, andthe polymerization time was 12 minutes. The polymer yield was 7.8 g.

The polymer indices were: density=0.8821 g/cm³, MFR=0.40 g/10 min,Mw=120,600, Mn=53,800, Mw/Mn=2.24, T_(m)=62.3° C.

Example 6

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound E was used in place ofthe metallocene compound A, 0.07 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 4.6 g.

The polymer indices were: density=0.8793 g/cm³, MFR=0.87 g/10 min,Mw=100,200, Mn=48,200, Mw/Mn=2.08, T_(m)=60.1° C.

Example 7

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound F was used in place ofthe metallocene compound A, 0.7 μmol of the cocatalyst was used, and thepolymerization time was 5 minutes. The polymer yield was 7.6 g.

The polymer indices were: density=0.8790 g/cm³, MFR=0.80 g/10 min,Mw=118,000, Mn=60,800, Mw/Mn=1.94, T_(m)=61.4° C., 1-hexene content 11.2mol %.

Example 8

The same polymerization operation as in Example 1 was carried out,except that 0.28 μmol of the metallocene compound G was used in place ofthe metallocene compound A, 0.14 μmol of the cocatalyst was used, andthe polymerization time was 12 minutes. The polymer yield was 4.7 g.

The polymer indices were: density=0.8775 g/cm³, MFR=0.52 g/10 min,Mw=110,600, Mn=53,700, Mw/Mn=2.06, T_(m)=59.0° C., 1-hexene content 11.5mol %.

Example 9

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound H was used in place ofthe metallocene compound A, 0.07 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 6.5 g.

The polymer indices were: density=0.8685 g/cm³, MFR=1.80 g/10 min,Mw=96,700, Mn=44,400, Mw/Mn=2.18, T_(m)=50.6° C., 1-hexene content 14.1mol %.

Example 10

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound I was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 7.7 g.

The polymer indices were: density=0.8740 g/cm³, MFR=1.56 g/10 min,Mw=101,100, Mn=52,900, Mw/Mn=1.91, T_(m)=56.0° C., 1-hexene content 12.5mol %.

Example 11

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound J was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 5.4 g.

The polymer indices were: density=0.8760 g/cm³, MFR=1.30 g/10 min,Mw=96,700, Mn=48,400, Mw/Mn=2.00, T_(m)=57.5° C., 1-hexene content 12.6mol %.

Example 12

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound K was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 6.9 g.

The polymer indices were: density=0.8806 g/cm³, MFR=1.65 g/10 min,Mw=93,500, Mn=47,900, Mw/Mn=1.95, T_(m)=61.7° C.

Example 13

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound L was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 13 minutes. The polymer yield was 7.0 g.

The polymer indices were: density=0.8831 g/cm³, MFR=0.71 g/10 min,Mw=111,000, Mn=55,800, Mw/Mn=1.99, T_(m)=62.7° C.

Example 14

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound M was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 3.3 g.

The polymer indices were: density=0.8842 g/cm³, MFR=0.83 g/10 min,Mw=115,500, Mn=60,800, Mw/Mn=1.90, T_(m)=63.4° C.

Example 15

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound N was used in place ofthe metallocene compound A, 0.07 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 7.3 g.

The polymer indices were: density=0.8767 g/cm³, MFR=0.31 g/10 min,Mw=140,200, Mn=66,800, Mw/Mn=2.10, T_(m)=59.0° C., 1-hexene content 11.5mol %.

Example 16

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound O was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 13 minutes. The polymer yield was 9.0 g.

The polymer indices were: density=0.8756 g/cm³, MFR=0.47 g/10 min,Mw=150,800, Mn=74,300, Mw/Mn=2.03, T_(m)=58.1° C.

Comparative Example 1

The same polymerization operation as in Example 1 was carried out,except that 0.48 μmol of the metallocene compound P was used in place ofthe metallocene compound A, 0.24 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 13.6 g.

The polymer indices were: density=0.8764 g/cm³, MFR=51 g/10 min,Mw=41,800, Mn=10,300, Mw/Mn=4.04, T_(m)=67.0° C., 1-hexene content 12.3mol %.

Comparative Example 2

The same polymerization operation as in Example 1 was carried out,except that 0.70 μmol of the metallocene compound Q was used in place ofthe metallocene compound A, 0.35 μmol of the cocatalyst was used, andthe polymerization time was 18 minutes. The polymer yield was 6.0 g.

The polymer indices were: Mw=6,800, Mn=3,100, Mw/Mn=2.17, T_(m)=62.0° C.

Comparative Example 3

The same polymerization operation as in Example 1 was carried out,except that 0.10 μmol of the metallocene compound R was used in place ofthe metallocene compound A, 0.05 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 6.0 g.

The polymer indices were: density=0.9053 g/cm³, MFR=0.47 g/10 min,Mw=131,900, Mn=32,500, Mw/Mn=4.06, T_(m)=88.3° C.

Comparative Example 4

The same polymerization operation as in Example 1 was carried out,except that 0.20 μmol of the metallocene compound S was used in place ofthe metallocene compound A, 0.10 μmol of the cocatalyst was used, andthe polymerization time was 12 minutes. The polymer yield was 6.8 g.

The polymer indices were: density=0.9073 g/cm³, MFR=0.35 g/10 min,Mw=144,100, Mn=12,800, Mw/Mn=11.29, T_(m)=95.8° C.

Comparative Example 5

The same polymerization operation as in Example 1 was carried out,except that 0.10 μmol of the metallocene compound T was used in place ofthe metallocene compound A, 0.05 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 7.0 g.

The polymer indices were: density=0.8962 g/cm³, MFR=0.51 g/10 min,Mw=120,900, Mn=63,600, Mw/Mn=1.90, T_(m)=83.7° C.

Example 17

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound U was used in place ofthe metallocene compound A, 0.07 μmol of the cocatalyst was used, andthe polymerization time was 5 minutes. The polymer yield was 4.3 g.

The polymer indices were: density=0.8673 g/cm³, MFR=0.65 g/10 min,Mw=129,600, Mn=67,500, Mw/Mn=1.92, T_(m)=50.5° C., 1-hexene content 13.4mol %.

Example 18

The same polymerization operation as in Example 1 was carried out,except that 0.14 μmol of the metallocene compound A was used, 0.28 μmolof the cocatalyst was used, 33 mL of 1-hexene was used, and thepolymerization time was 12 minutes. The polymer yield was 5.4 g.

The polymer indices were: density=0.8965 g/cm³, MFR=0.19 g/10 min,Mw=169,100, Mn=90,900, Mw/Mn=1.86, T_(m)=80.2° C., 1-hexene content 6.6mol %.

Example 19

The same polymerization operation as in Example 1 was carried out,except that 0.13 μmol of the metallocene compound C was used in place ofthe metallocene compound A, 0.26 μmol of the cocatalyst was used, 33 mLof 1-hexene was used, and the polymerization time was 13 minutes. Thepolymer yield was 7.0 g.

The polymer indices were: density=0.8948 g/cm³, MFR=0.24 g/10 min,Mw=212,800, Mn=101,300, Mw/Mn=2.10, T_(m)=79.9° C.

Example 20

The same polymerization operation as in Example 1 was carried out,except that 0.15 μmol of the metallocene compound C was used in place ofthe metallocene compound A, 0.30 μmol of the cocatalyst was used, 96 mLof 1-hexene was used, and the polymerization time was 12 minutes. Thepolymer yield was 14.3 g.

The polymer indices were: density=0.8593 g/cm³, MFR=3.7 g/10 min,Mw=81,500, Mn=40,800, Mw/Mn=2.00, T_(m)=40.4° C., 1-hexene content 17.5mol %.

Comparative Example 6

The same polymerization operation as in Example 1 was carried out,except that 0.30 μmol of the metallocene compound P was used in place ofthe metallocene compound A, 0.15 μmol of the cocatalyst was used, 33 mLof 1-hexene was used, and the polymerization time was 5 minutes. Thepolymer yield was 19.1 g.

The polymer indices were: density=0.8981 g/cm³, MFR=5.3 g/10 min,Mw=84,400, Mn=19,200, Mw/Mn=4.40, T_(m)=77.8° C.

Comparative Example 7

The same polymerization operation as in Example 1 was carried out,except that 0.80 μmol of the metallocene compound Q was used in place ofthe metallocene compound A, 0.40 μmol of the cocatalyst was used, 33 mLof 1-hexene was used, and the polymerization time was 12 minutes. Thepolymer yield was 15.1 g.

The polymer indices were: MFR=3600 g/10 min, Mw=8,200, Mn=3,600,Mw/Mn=2.25, T_(m)=75.7° C.

Example 21

The same polymerization operation as in Example 1 was carried out,except that 0.10 μmol of the metallocene compound C was used in place ofthe metallocene compound A, 0.20 μmol of the cocatalyst was used, 62 mLof 1-hexene was used, the polymerization temperature was 125° C., andthe polymerization time was 12 minutes. The polymer yield was 8.0 g.

The polymer indices were: density=0.8745 g/cm³, MFR=0.04 g/10 min,Mw=287,600, Mn=126,700, Mw/Mn=2.27, T_(m)=56.0° C., 1-hexene content12.3 mol %.

Comparative Example 8

The same polymerization operation as in Example 1 was carried out,except that 0.10 μmol of the metallocene compound P was used in place ofthe metallocene compound A, 0.05 μmol of the cocatalyst was used, 62 mLof 1-hexene was used, the polymerization temperature was 125° C., andthe polymerization time was 4 minutes. The polymer yield was 10.9 g.

The polymer indices were: density=0.8750 g/cm³, MFR=0.44 g/10 min,Mw=147,200, Mn=68,100, Mw/Mn=2.16, T_(m)=58.6° C.

The properties of Examples 1 to 17 and Comparative Examples 1 to 5 arecollectively shown in Table 1, and the properties of Examples 1, 4, 18to 21 and Comparative Examples 1, 2, 6 to 8 are in Table 2.

TABLE 1 Performance Comparison between Metallocene Compounds at the samepolymerization temperature (150° C.) and under the same 1-hexeneconcentration (58 mL) Metallocene MFR Density Tm C6 Content ExampleCompound Mn Mw/Mn [g/10 min] [g/cm³] [° C.] [mol %] Example 1 A 51,5001.92 1.22 0.8804 61.2 11.1 Example 2 A 51,700 2.09 0.79 0.8800 59.6 —Example 3 B 52,100 2.00 0.87 0.8793 60.0 — Example 4 C 84,800 2.02 0.180.8770 59.4 11.4 Example 5 D 53,800 2.24 0.40 0.8821 62.3 — Example 6 E48,200 2.08 0.87 0.8793 60.1 — Example 7 F 60,800 1.94 0.80 0.8790 61.411.2 Example 8 G 53,700 2.06 0.52 0.8775 59.0 11.5 Example 9 H 44,4002.18 1.80 0.8685 50.6 14.1 Example 10 I 52,900 1.91 1.56 0.8740 56.012.5 Example 11 J 48,400 2.00 1.30 0.8760 57.5 12.6 Example 12 K 47,9001.95 1.65 0.8806 61.7 — Example 13 L 55,800 1.99 0.71 0.8831 62.7 —Example 14 M 60,800 1.90 0.83 0.8842 63.4 — Example 15 N 66,800 2.100.31 0.8767 59.0 11.5 Example 16 O 74,300 2.03 0.47 0.8756 58.1 —Example 17 U 67,500 1.92 0.65 0.8673 50.5 13.4 Comparative Example 1 P10,300 4.04 51 0.8764 67.0 12.3 Comparative Example 2 Q 3,100 2.17 —unmeasurable* 62.0 — Comparative Example 3 R 32,500 4.06 0.47 0.905388.3 — Comparative Example 4 S 12,800 11.29 0.35 0.9073 95.8 —Comparative Example 5 T 63,600 1.90 0.51 0.8962 83.7 — *Unmeasurable asthe molecular weight is too low. —: Not measured.

TABLE 2 Performance Comparison between Metallocene Compounds at adifferent polymerization temperature and under a different 1-hexeneconcentration Polymerization Metallocene C6 Amount Temperature MFRDensity Tm C6 Content Example Compound [mL] [° C.] Mn Mw/Mn [g/10 min][g/cm³] [° C.] [mol %] Example 18 A 33 150 90,900 1.86 0.19 0.8965 80.2 6.6 Example 1 A 58 150 51,500 1.92 1.22 0.8804 61.2 11.1 Example 19 C33 150 101,300 2.10 0.24 0.8948 79.9 — Example 4 C 58 150 84,800 2.020.18 0.8770 59.4 11.4 Example 20 C 96 150 40,800 2.00 3.7 0.8593 40.417.5 Comparative Example 6 P 33 150 19,200 4.40 5.3 0.8981 77.8 —Comparative Example 1 P 58 150 10,300 4.04 51 0.8764 67.0 12.3Comparative Example 7 Q 33 150 3,600 2.25 3600 * 75.7 — ComparativeExample 2 Q 58 150 3,100 2.17 — * 62.0 — Example 21 C 62 125 126,7002.27 0.04 0.8745 56.0 12.3 Comparative Example 8 P 62 125 68,100 2.160.44 0.8750 58.6 — *: Unmeasurable as the molecular weight is too low.—: Not measured.

<3> Continuous High-Pressure Ion Polymerization:Ethylene/Propylene/1-Hexene Copolymerization

As in Table 3, polymerization was carried out continuously in a 5.0-Lstainless autoclave reactor (equipped with a stirrer) that had beenfully dried and purged with nitrogen, under a polymerization pressure ofabout 80 MPa and at a temperature falling within a range of from 200 to260° C. Ethylene, propylene and hexene were continuously supplied in thepolymerization system to be in a predetermined monomer ratio, and thepolymerization pressure was controlled by a pressure control valve. As ascavenger, a tri(n-octyl)aluminium/heptane solution controlled to be 30mg/L was continuously supplied. The metallocene compound and thecocatalyst [Me₂N(H)C₆H₅][B(C₆F₅)₄] were separately prepared as toluenesolutions (each having a concentration of from 20 to 50 mg/L, or from 37to 120 mg/L, respectively), and while mixed in the pipe line, the twowere continuously supplied to the polymerization system. The supplyspeed of the metallocene compound and the cocatalyst was so controlledthat the polymerization system could be at a predetermined temperature.During the polymerization, any additional solvent was not used exceptthe solvent that would be carried in the system as the solvent for thecatalyst/cocatalyst solution and the solvent for the scavenger solution.The retention time was controlled to be within a range of from 210 to230 seconds.

The details of the polymerization conditions in Examples I to VII andComparative Examples I and II, including the supply rate of themetallocene compound (M), the cocatalyst (B) and the organic Al, themolar ratio of B/M and the molar ratio of Al/M of the supplied catalystcomponents, the monomer supply rate, the molar ratio of the suppliedmonomers and the polymerization temperature, and also the details of thepolymerization results therein including the production rate and thecatalyst activity as well as the density of the polymer obtained, themolecular weight, the molecular weight distribution and MFR of thepolymer calculated from the data in GPC, the melting point thereofdetermined through DSC, and the propylene/hexene content in the polymerdetermined through ¹³C-NMR are shown in Table 3.

TABLE 3 High-Pressure Ion Polymerization Results Example Compar- Compar-ative ative Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple Iple II ple III ple IV ple V ple VI ple VII ple I ple II Metallocene C CA A H H U P P Compound Complex Supply Rate 62 38 42 21 47 46 34 54 29[mg/h] cocatalyst Supply Rate 107 64 79 48 70.2 67.4 93 82 82 [mg/h]Organic Al 2.6 2.6 2.1 2.2 2.2 2.2 3.1 4.9 4.9 Supply Rate [g/h] B/M[mol/mol] 1.4 1.4 1.5 1.8 1.7 1.6 3.1 1.3 2.4 Al/M [mol/mol] 415 415 329344 489 489 698 820 820 Ethylene Supply Rate 20.5 20.8 21 20.6 20.8 20.720.8 22.1 22.1 [kg/h] Propylene Supply Rate 6.7 6.7 6.9 6.7 6.7 6.7 6.76.7 6.7 [kg/h] Hexene Supply Rate 13.3 13.2 13.5 13.5 13.3 13.3 13.313.5 13.5 [kg/h] Molar Ratio 70/ 70/ 70/ 70/ 70/ 70/ 70/ 71/ 71/ ofSupplied 15/15 15/15 15/15 15/15 15/15 15/15 15/15 14.5/14.5 14.5/14.5C2/C3/C6 Polymerization 250 230 250 230 250 230 230 240 210 Temperature[° C.] Production Rate [kg/h] 6.2 6.2 6.8 6.8 8.0 8.0 6.5 6.4 6.4Catalyst Activity 100 163 163 324 171 175 192 119 222 [kg-PE/g-complex]Mn 24600 34500 17000 21300 19500 25900 30800 4800 83 Mw/Mn 1.98 1.922.44 2.55 1.94 1.86 1.88 4.97 4.59 MFR [g/10 min] 29.2 9 56 19 96 36 18630 103 Density [g/cm3] 0.8909 0.8864 0.8923 0.8875 0.8775 0.8718 0.87190.8944 0.8834 Tm [° C.] 79.2 72 81 74 59 55 no 78(104,119) 69(93) C3Content [mol %] 5.4 5.8 — 5.8 8 8.7 8.2 — 6.6 C6 Content [mol %] 4.8 5.2— 5.3 5.4 6.4 6.5 — 5.8 —: Not measured.

Discussion on Comparison Results Between Examples and ComparativeExamples

As obvious from Table 1, comparison between Examples 1 to 17 andComparative Examples 1 to 5 that are the polymerization results at thesame polymerization temperature and in the same monomer ratio verifiesthat the catalyst of the present invention can give ahigh-molecular-weight ethylene copolymer while exhibiting excellentcopolymerizability. Also as obvious from Table 2, comparison betweenExamples 1, 4, 18 to 20 and Comparative Examples 1, 2, 6 and 7 that arethe polymerization results in a monomer ratio differing from theabove-mentioned polymerization condition, and comparison between Example21 and Comparative Example 8 that are the polymerization results at adifferent polymerization temperature verify that the superiority of thecatalyst of the present invention extends a broad ethylene/comonomerratio range and a broad polymerization temperature range. In addition,as obvious from comparison between Examples and Comparative Examples inTable 3, the effect can exhibit even underhigh-temperature/high-pressure conditions, and in particular, thesuperiority of the catalyst of the present invention to already-existingcatalysts is more remarkable in point of the molecular weight of theproduced polymers.

While the present invention has been described in detail and withreference to specific embodiments thereof, it will be apparent to oneskilled in the art that various changes and modifications can be madetherein without departing from the spirit and scope thereof. The presentapplication is based on a Japanese patent application (PatentApplication 2013-036535) filed Feb. 27, 2013, the contents thereof beinghereby incorporated by reference.

INDUSTRIAL APPLICABILITY

As obvious from the above, use of the metallocene compound of thepresent invention as a polymerization catalyst provides ahigh-molecular-weight olefin copolymer while maintaining the excellentolefin copolymerizability as compared with already-existing complexcatalyst systems in olefin copolymerization. In particular, the catalystenables production of an ethylenic copolymer having a low density and ahigh molecular weight.

Accordingly, the olefin polymerization catalyst of the present inventionand the production method for an olefin polymer using the olefinpolymerization catalyst make it possible to carry out the polymerizationunder industrially-advantageous polymerization temperature andcondition, and the industrial value of the present invention isextremely great.

In addition, the olefin copolymer produced through polymerization usingthe metallocene compound of the present invention has excellentmechanical properties, and are widely used covering from industrial-usematerials and life materials, for example, as films, sheets, fibers,nonwoven fabrics, various containers, molded articles, modifiers, etc.

The invention claimed is:
 1. A metallocene compound represented by thefollowing formula [I]:

in which: M represents Ti, Zr, or Hf; X¹ and X² are the same ordifferent, each representing a hydrogen atom, an alkyl group having from1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms,an aryl group having from 6 to 20 carbon atoms, an aryloxy group havingfrom 6 to 10 carbon atoms, an alkenyl group having from 2 to 10 carbonatoms, an arylalkyl group having from 7 to 40 carbon atoms, an alkylarylgroup having from 7 to 40 carbon atoms, an arylalkenyl group having from8 to 40 carbon atoms, an alkyl group having from 1 to 20 carbon atomsand substituted with a silyl group having a hydrocarbon group havingfrom 1 to 6 carbon atoms, a substituted amino group having from 1 to 10carbon atoms, a group OH, or a halogen atom; R¹ to R⁹ and R¹¹ to R¹⁹ arethe same or different, each representing a hydrogen atom, a halogenatom, an alkyl group having from 1 to 10 carbon atoms, a halogenoalkylgroup having from 1 to 10 carbon atoms, an aryl group having from 6 to20 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, asilyl group having a hydrocarbon group having from 1 to 6 carbon atoms,an alkyl group having from 1 to 20 carbon atoms and substituted with asilyl group having a hydrocarbon group having from 1 to 6 carbon atoms,a group —NR²¹ ₂, a group —SR²¹, a group —OSiR²¹ ₃, or a group —PR²¹ ₂,in which R²¹'s are the same or different, each representing a halogenatom, an alkyl group having from 1 to 10 carbon atom or an aryl grouphaving from 6 to 20 carbon atoms, the neighboring groups of R¹ to R⁹ andR¹¹ to R¹⁹ optionally form one or more aromatic rings or aliphatic ringsalong with the atom bonding them, or R⁴ and R⁵, or R⁴ and R⁹, or R¹⁴ andR¹⁵, or R¹⁴ and R¹⁹ optionally form one aromatic ring or aliphatic ringalong with the atom bonding them; R¹⁰ and R²⁰ are the same or different,each representing an alkyl group having from 1 to 10 carbon atoms, afluoroalkyl group having from 1 to 10 carbon atoms, an alkoxy grouphaving from 1 to 10 carbon atoms, an aryl group having from 6 to 20carbon atoms, a fluoroaryl group having from 6 to 10 carbon atoms, anaryloxy group having from 6 to 10 carbon atoms, an alkenyl group havingfrom 2 to 10 carbon atoms, an arylalkyl group having from 7 to 40 carbonatoms, an alkylaryl group having from 7 to 40 carbon atoms, or anarylalkenyl group having from 8 to 40 carbon atoms, provided that R¹⁰and R²⁰ form one or more rings along with the atom bonding them.
 2. Themetallocene compound according to claim 1, wherein R⁵ to R⁹ and R¹⁵ toR¹⁹ are the same or different, each representing a hydrogen atom, ahalogen atom, an alkyl group having from 1 to 10 carbon atoms, ahalogenoalkyl group having from 1 to 10 carbon atoms, an aryl grouphaving from 6 to 10 carbon atoms, a group —NR²¹ ₂, a group —SR²¹, agroup —OSiR²¹ ₃, or a group —PR²¹ ₂, in which R²¹'s are the same ordifferent, each representing a halogen atom, an alkyl group having from1 to 10 carbon atom or an aryl group having from 6 to 10 carbon atoms,and all of R⁵ to R⁹ and R¹⁵ to R¹⁹ are not hydrogen atoms at the sametime.
 3. The metallocene compound according to claim 1, wherein R¹⁰ andR²⁰ are the same or different, each representing a halogen atom, analkyl group having from 1 to 10 carbon atoms, a fluoroalkyl group havingfrom 1 to 10 carbon atoms, an aryl group having from 7 to 10 carbonatoms, a fluoroaryl group having from 6 to 10 carbon atoms, an alkenylgroup having from 2 to 10 carbon atoms, an arylalkyl group having from 7to 40 carbon atoms, an alkylaryl group having from 7 to 40 carbon atomsor an arylalkenyl group having from 8 to 40 carbon atoms, provided thatthe total of the carbon atoms that R¹⁰ and R²⁰ contain is 2 or more, andR¹⁰ and R²⁰ form one or more rings along with the atom bonding them. 4.The metallocene compound according to claim 1, wherein the ring formedby R¹⁰ and R²⁰ is a 4-membered ring or a 5-membered ring.
 5. Themetallocene compound according to claim 1, wherein M is Hf.